Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips and adjustable, removable sternum strap.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips and adjustable, removable sternum strap.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips and adjustable, removable sternum strap.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips and adjustable, removable sternum strap.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips and adjustable, removable sternum strap.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.
Medium Knack Pack. Clean design with organization pockets.
Medium Knack Pack. Unexpanded for day use.
Side view, unexpanded for day use. 17 liters unexpanded.
Side view, expanded for travel use. 31 liters expanded.
Ergonomically-designed comfort foam shoulder straps with easy-release clips and adjustable, removable sternum strap.
Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes.
Trolley sleeve for longer trips.
Medium Knack Pack unexpanded and expanded on 5'10" model.

Medium Expandable Knack Pack®

Regular price $195

The Medium Expandable Knack Pack is our most popular bag. Unexpanded, it is perfect for every day, around-town carrying. Ready to travel? Expand the hidden suitcase compartment and pack what you need for a 2-3 day trip. Learn More


500 left in stock

 
Free shipping
&
Ships fast
Packing Dimensions
Medium Large
Unexpanded
Medium Knack Backpack Unexpanded 17 Liters
17 Liters
Large Knack Backpack Unexpanded 22 Liters
22 Liters
Expanded
Medium Knack Backpack Expanded 31 Liters
17 L + 14 L = 31 Liters
Large Knack Backpack Expanded 37 Liters
22 L + 15 L = 37 Liters
Additional Specs
Medium Large
Weight Icon
Weight
2 lb 11 oz 3 lb 4 oz
Laptop Icon
Laptop
15" 17"
Plane Overhead Icon
Overhead
All Jets All Jets
Plane Under Seat Icon
Under Seat
All Jets Doesn't fit (when expanded)
Outfits Icon
Outfits
2-3 3-4
Water Bottle Pocket Icon
Water Bottle Pocket
17 oz S'well™ 25 oz S'well™
Tuck-Away Hip Strap Icon
Tuck-Away Hip Strap
No Yes

Size Chart

Model: 5'5"

Knack Backpacks on 5 foot 5 inch model

Medium

Large

Model: 5'11"

Knack Backpacks on 5 foot 11 inch model

Medium

Large

Model: 6'3"

Knack Backpacks on 6 foot 3 inch model

Medium

Large

Laptop

Fits 15" Laptop

Overhead

All Jets

Under Seat

All Jets

Outfits

2-3

Not sure what size you need? See comparison and size chart

KEY FEATURES

Key Medium Expandable Backpack Everyday Features

  • Easy-access, padded side-zip computer pocket for 15" laptops
  • Spacious main compartment with organization pockets, fleece-lined tablet pocket and removable key leash
  • Hidden, zip-away side water bottle pocket

Key Knack Backpack Travel Features

  • Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes 
  • Meets most popular carry-on requirements as well as fits under most seats
  • Packing compartment with easy-access suitcase lid 

Key Medium Pack Technical Features

  • Custom-developed, durable, water-resistant body fabric 
  • Molded, comfort-cool foam back panel
  • YKK™ water-resistant zipper with custom-designed pullers

CORPORATE SALES

For orders over 10 units or for Knack Products with custom corporate logos, please contact: corporate@knackbags.com.

PRODUCT DETAILS

Pack Dimensions (LxWxD):

Unexpanded: 19" x 12" x 4.5"

Expanded: 19" x 12" x 9.5"

Volume:

Unexpanded: 17 Liters

Expanded: 31 Liters

Weight: 2 pounds 11 ounces (Just a bit more than 2 Grande Coffees)

Laptop Pocket Dimensions (LxWxD):

Dimensions: 15.5" x 11" x 2"

Pocket Opening: 15"

Fabric: Suiting-inspired, custom-developed, water-resistant 1200 denier two tone polyester body fabric. Tested to carry loads up to 40 pounds.


Lining Fabric: Custom, stain-resistant, antimicrobial 150D Nylon fabric lining


Zippers: Water-resistant YKK™ reverse coil zippers


Zipper Pullers: Strong, custom-designed cast zinc zipper pullers with comfortable PU overmold and chip-resistant PVD coating


Hardware: Duraflex™ buckles and sliders


Back Panel Material: Molded, comfort-cool foam back panel

Everyday Features:

  • Spacious main compartment with lockable zippers
  • Protective, fleece-lined internal tablet pocket
  • 2 interior, see-through, soft monofilament mesh zip organization pockets
  • Handy removable interior key leash
  • Built-in, fleece-lined, protective soft case sunglasses pocket
  • Easy-access, front triangle pocket with RFID-blocking lining, business card pockets and passport pocket
  • Exterior charger and battery pocket with pen loops
  • Large zip-away side water bottle pocket holds 17 ounce S'well™/24 ounce Hydro Flask™ bottles
  • Padded, side computer pocket fits up to 15" laptops (measured diagonally)
  • Comfort-foam top carry handle
  • Ergonomically-designed comfort foam shoulder straps with easy-release clips
  • Elastic keepers for shoulder strap
  • Adjustable, removable sternum strap helps make heavier loads more comfortable

Travel Features:

  • Separate, patent-pending, expandable 14 cubic liter packing compartment with easy-access suitcase lid opening
  • Hidden trolley sleeve slips over wheeled luggage handles
  • Lockable zippers on travel compartment
  • Internal packing compression system
  • Large, see-through, soft monofilament mesh zip packing pocket
  • Rain flap covering expansion zipper
  • Tuck-away back storage pocket for shoulder straps

HOW TO LIVE A ONE BAG LIFE - EVERY DAY

STAY CONNECTED

Use the Knack Pack’s padded side computer pocket to always keep your laptop with you. The pocket fits 15” laptops (measured diagonally) and its false bottom helps keep your computer safely off the floor whenever you put your bag down.

ORGANIZE THOSE CORDS

The easy access charger and battery pocket helps keep all those cords, chargers, adapters, batteries and USB sticks that you can’t live without in one neat place instead of rolling around in the bottom of your bag.

BRING YOUR SHADES

The fleece-lined, soft case sunglasses pocket is designed for easy access and protection. And there’s a bonus pocket behind it for other items you need at a minute’s notice.

HOLD THE CARDS

Feel free to throw in a bunch of business cards - there’s plenty of room in the organizer panel. Also, rest assured that your passport and wallet are safe. Our RFID blocking fabric protects your RFID chip cards from unwanted skimming.

STAY ON KEY

Our removable, easy-access key leash makes it a breeze to bring your keys with you everywhere.

CARRY IT ALL

The Knack Pack’s main compartment has two generously-sized, soft monofilament mesh, zip organization pockets. Our special mesh makes it easy to always see all the things you stuff into the pockets. If that’s not enough, there’s a protective fleece-lined pocket to keep your tablet safe and sound. Main compartment is 17 liters.

DON’T LOOK LIKE A HIKER

Only you will know that the sleek, hidden, zip-away side water bottle pocket holds your 17oz S'well® or 24 oz Hydro Flask® water bottle.

HOW TO LIVE A ONE BAG LIFE - TRAVEL

EXPAND YOUR HORIZONS

Our patent-pending, hidden expansion compartment is the secret sauce that makes Knack the perfect One Bag Life backpack. Simply unzip and expand the compartment to get over 80% more carrying capacity. Unexpanded: 17 Liters. Expanded: 31 Liters.

PACK IT IN

Not sure about staying in town after your business trip ends? Pack our patent-pending, hidden suitcase compartment with a change of clothes and live spontaneously Packing capacity: 14 Liters.

LOCK ON

Keep everything secure during your journeys with lockable zippers on the hidden suitcase and the main compartment. (Lock not included)

BE COMPATIBLE

Sometimes, your trips require a big piece of wheeled luggage. Don’t worry, it’s easy to bring your Knack Pack along too. Our hidden trolley sleeve lets you slip your Knack over the handle of almost all sizes of wheeled luggage.

STAY FLEXIBLE

Our adjustable sternum strap does a great job of distributing weight when you’ve really packed your Knack. But if you prefer a cleaner look, the strap unhooks for easy removal.

BE PREPARED

It should never happen, but if that flight attendant makes you check your backpack, don’t worry about your straps getting caught on the luggage carousel. Simply unclip your straps and stow them out of the way in the back panel pocket.

KEEP DRY

While we don’t recommend swimming with your Knack Pack, our specially coated fabric and reverse coil zippers help keep your belongings dry in all types of weather.

SMELL LIKE A ROSE

Our custom-designed lining brightens up your day and ensures things never get lost in your bag. And our special antimicrobial treatment helps to keep everything fresh even when you’ve packed dirty or sweaty clothes.

LOOK SHARP

Inspired by tailored clothing fabrics, Knack’s custom-designed, two-tone fabric is both lightweight and durable.

Customer Reviews

Based on 93 reviews
84%
(78)
15%
(14)
1%
(1)
0%
(0)
0%
(0)
J
J.C.
Everything you need in a bag

I travel often and had trouble finding a bag that could hold electronics, extra clothes and basic needs. This bag was fantastic on my last trip. Glad I finally found a great bag!

T
T.M.
Constant companion

Goes with me everywhere...carries everything from electronics, tech equipment, medications, toys, camera, writing material and pens plus more than any briefcase I have ever had......and things are organized and easy to find. Open the expansion and add a jacket or rain gear plus. Pack well for overnight trip. Purchased the Large bag as well for extended trips. Waiting on the small bag for my 14 year old daughter’s school bag!

D
D.G.
Best Bag I've had

I was honestly a bit skeptical at first. The reviews were great but you never know if what worked for someone else will work for you. I may be hooked for life. I love the design and user experience for a work bag, but I'm also thrilled at how easy I can expand the bag to accommodate a 2-3 day work trip (with the same suit). No complaints at all. Constructive is solid. Design is clean and modern and intelligently utilitarian. I will agree with some constructive feedback that the back can get a bit warm. But the trade-off is a secure and well-padded home for my laptop.

My only disappointment is that it arrived a couple of weeks ago and this week I received an email that a new and improved version will be released soon. Oh well. At this pace of everyday use, I think it'll be several years before this one is replaced. Well done team Knack.

D
D.J.
I love this bag!

I love this bag! Having recently moved into flexible space (which I surprisingly love), I needed a bigger bag to hold my stuff and I wanted a bag I could quickly grab my computer out off and stuff back into. I also needed a space for my ipad, my purse, my cord bag, etc.. This is great. I did want a bag that looked less "backpack'y" but you can't have everything. I also really like the hidden water bottle compartment - makes the overall look more business appropriate and less like I'm about to go on a hike. Very comfortable on my back. Since the back straps can be hidden, I do wish it came with a shoulder strap to carry cross body. But all around a win.

T
T.K.
Awesome Bag

I researched and researched bags. I've bought many (just ask my wife, she keeps count). This is the game changer for me. I can't tell you how amazing it is to have a dedicated water bottle pocket that zips shut. Keeps it safe from dirty aircraft floors! Unexpanded I can fit clothes for a day and expanded I'll use it for a 3 day trip with no issue.

The ONLY issue I see is the lack of usable organization in the very front triangle pouch but I'm managing. You can also fit a lot in the main compartment. more than i thought it would. It's also pretty comfortable.

M
M.D.S.
Greatest backpack! It REALLY enables a "one bag life"

Brilliant back pack. Light enough. Super durable. Very compact and comfortable for everyday use, super roomy when expanded. It really enables a "on bag life". This summer I went to Tuscany, Italy, for a week and I only brought my black, medium Knack backpack. I really enjoyed to be able to carry everything in just one bag... hands free. Even when completely full it's very comfortable on the shoulders. And it is plenty of pockets. So many pockets, indeed: you can store everything, from smallest to biggest items, and immediately find what you are looking for. Awesome. In particular I love the possibility to hide the water bottle in the special zippered compartement (which I used for the water bottle this summer and I'm goind to use to store an umbrella during cold months). This is what I was able to put inside the medium backpack (expanded): 7 Lacoste, 7 T-shirts, 7 pants, 7 socks, 1 trousers, two swimsuits, 1 bermuda, 2 shirts, 1 pajamas, 1 medium toiletry bag, 1 iPad, 1 kindle, 1 TomTom car GPS, 2 mobiles, all the cables and battery chargers, 1 Hobonichi mega weeks, my small kit for calligraphy (...yes, I'm learning some calligraphic alphabets), 1 Knack black water bottle (btw, it is a really a good bottle: beautiful design, very good quality material, keeps liquid fresh for many hours), 2 earbuds, 1 Cord Mojo DAC, 1 small bag (15x10x3 cm) containing small items I always bring with me (pen, sd card reader, a battery pack, foldable shopper bag, kleenex, etc), 1 book, travel papers, keys, some snacks and few other things. It is amazing how many things it can contain.
I daily use it without paying too much care to it and after two monts it seems just unpacked. It resisted also to many "ferocious" attacks of my two cats!
I am supremely satisfied by my Knack pack. I do prefer it to any other backpack I own (some of wich are very very good products indeed). Best purchase of the year! Recommended without any doubt or hesitation.

M
M.H.
One Bag to Rule Them All

I was guilty of buying (and returning) bag after bag looking for the right combination of features and organization. All that stopped when I purchased my Knack. It has room for everything I need to take it from the office, to the road, to the hotel, to the field, and back again. Very impressed with the build quality and materials. I'm looking forward to using my Knack as my mobile office and wardrobe for years to come.

D
D.A.
Loving it!

My knack bag is one of the best purchases I’ve ever made. I’ve used it on several long weekend trips and it’s the only bag I need. The design is impeccable, with pockets galore. I’m truly amazed by how much it holds. Bravo!

A
A.P.
Bag Addict Approved

As someone who is generally addicted to buying new backpacks way more often than anyone should, I gotta say, I'm very pleased with this Knack bag. Originally bought my bag to use for commuting to and from work on the bike. Now I use it for everything. Camping, weekend trips, and everything in between. Super comfortable and not too big for daily use. Definitely think I can embrace the One Bag Life with this one.

c
c.g.
virtually perfect

there are thousands of backpacks out there, but this design is virtually perfect if you need to carry a change of clothes with your other stuff. not an inch wasted. my 1 wish is for an upgrade on the fabric used to make the bag. a more supple ballistic nylon would make it totally perfect. great color selection.

Customer Reviews

Based on 93 reviews
84%
(78)
15%
(14)
1%
(1)
0%
(0)
0%
(0)
J
J.C.
Everything you need in a bag

I travel often and had trouble finding a bag that could hold electronics, extra clothes and basic needs. This bag was fantastic on my last trip. Glad I finally found a great bag!

T
T.M.
Constant companion

Goes with me everywhere...carries everything from electronics, tech equipment, medications, toys, camera, writing material and pens plus more than any briefcase I have ever had......and things are organized and easy to find. Open the expansion and add a jacket or rain gear plus. Pack well for overnight trip. Purchased the Large bag as well for extended trips. Waiting on the small bag for my 14 year old daughter’s school bag!

D
D.G.
Best Bag I've had

I was honestly a bit skeptical at first. The reviews were great but you never know if what worked for someone else will work for you. I may be hooked for life. I love the design and user experience for a work bag, but I'm also thrilled at how easy I can expand the bag to accommodate a 2-3 day work trip (with the same suit). No complaints at all. Constructive is solid. Design is clean and modern and intelligently utilitarian. I will agree with some constructive feedback that the back can get a bit warm. But the trade-off is a secure and well-padded home for my laptop.

My only disappointment is that it arrived a couple of weeks ago and this week I received an email that a new and improved version will be released soon. Oh well. At this pace of everyday use, I think it'll be several years before this one is replaced. Well done team Knack.

D
D.J.
I love this bag!

I love this bag! Having recently moved into flexible space (which I surprisingly love), I needed a bigger bag to hold my stuff and I wanted a bag I could quickly grab my computer out off and stuff back into. I also needed a space for my ipad, my purse, my cord bag, etc.. This is great. I did want a bag that looked less "backpack'y" but you can't have everything. I also really like the hidden water bottle compartment - makes the overall look more business appropriate and less like I'm about to go on a hike. Very comfortable on my back. Since the back straps can be hidden, I do wish it came with a shoulder strap to carry cross body. But all around a win.

T
T.K.
Awesome Bag

I researched and researched bags. I've bought many (just ask my wife, she keeps count). This is the game changer for me. I can't tell you how amazing it is to have a dedicated water bottle pocket that zips shut. Keeps it safe from dirty aircraft floors! Unexpanded I can fit clothes for a day and expanded I'll use it for a 3 day trip with no issue.

The ONLY issue I see is the lack of usable organization in the very front triangle pouch but I'm managing. You can also fit a lot in the main compartment. more than i thought it would. It's also pretty comfortable.

M
M.D.S.
Greatest backpack! It REALLY enables a "one bag life"

Brilliant back pack. Light enough. Super durable. Very compact and comfortable for everyday use, super roomy when expanded. It really enables a "on bag life". This summer I went to Tuscany, Italy, for a week and I only brought my black, medium Knack backpack. I really enjoyed to be able to carry everything in just one bag... hands free. Even when completely full it's very comfortable on the shoulders. And it is plenty of pockets. So many pockets, indeed: you can store everything, from smallest to biggest items, and immediately find what you are looking for. Awesome. In particular I love the possibility to hide the water bottle in the special zippered compartement (which I used for the water bottle this summer and I'm goind to use to store an umbrella during cold months). This is what I was able to put inside the medium backpack (expanded): 7 Lacoste, 7 T-shirts, 7 pants, 7 socks, 1 trousers, two swimsuits, 1 bermuda, 2 shirts, 1 pajamas, 1 medium toiletry bag, 1 iPad, 1 kindle, 1 TomTom car GPS, 2 mobiles, all the cables and battery chargers, 1 Hobonichi mega weeks, my small kit for calligraphy (...yes, I'm learning some calligraphic alphabets), 1 Knack black water bottle (btw, it is a really a good bottle: beautiful design, very good quality material, keeps liquid fresh for many hours), 2 earbuds, 1 Cord Mojo DAC, 1 small bag (15x10x3 cm) containing small items I always bring with me (pen, sd card reader, a battery pack, foldable shopper bag, kleenex, etc), 1 book, travel papers, keys, some snacks and few other things. It is amazing how many things it can contain.
I daily use it without paying too much care to it and after two monts it seems just unpacked. It resisted also to many "ferocious" attacks of my two cats!
I am supremely satisfied by my Knack pack. I do prefer it to any other backpack I own (some of wich are very very good products indeed). Best purchase of the year! Recommended without any doubt or hesitation.

M
M.H.
One Bag to Rule Them All

I was guilty of buying (and returning) bag after bag looking for the right combination of features and organization. All that stopped when I purchased my Knack. It has room for everything I need to take it from the office, to the road, to the hotel, to the field, and back again. Very impressed with the build quality and materials. I'm looking forward to using my Knack as my mobile office and wardrobe for years to come.

D
D.A.
Loving it!

My knack bag is one of the best purchases I’ve ever made. I’ve used it on several long weekend trips and it’s the only bag I need. The design is impeccable, with pockets galore. I’m truly amazed by how much it holds. Bravo!

A
A.P.
Bag Addict Approved

As someone who is generally addicted to buying new backpacks way more often than anyone should, I gotta say, I'm very pleased with this Knack bag. Originally bought my bag to use for commuting to and from work on the bike. Now I use it for everything. Camping, weekend trips, and everything in between. Super comfortable and not too big for daily use. Definitely think I can embrace the One Bag Life with this one.

c
c.g.
virtually perfect

there are thousands of backpacks out there, but this design is virtually perfect if you need to carry a change of clothes with your other stuff. not an inch wasted. my 1 wish is for an upgrade on the fabric used to make the bag. a more supple ballistic nylon would make it totally perfect. great color selection.

Living a One Bag Life