Knack Medium Expandable Backpack Unexpanded for day use
Knack Medium Expandable Backpack Simple design with organization pockets
Knack Medium Expandable Backpack Unexpanded for day use
Knack Medium Expandable Backpack Simple design with organization pockets
Knack Medium Expandable Backpack Unexpanded for day use
Knack Medium Expandable Backpack in green colour
Knack Medium Expandable Backpack Unexpanded for day use in orange
Knack Medium Expandable Backpack Simple design with organization pockets in orange
Knack Medium Expandable Backpack with Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes
Knack Medium Expandable Backpack with Built-in, fleece-lined, protective soft case sunglasses pocket
Knack Medium Expandable Backpack with Hidden, zip-away side water bottle pocket
Spacious main compartment with organization pockets, fleece-lined tablet pocket and key leash
Exterior charger and battery pocket
Easy-access front triangle pocket with business card slots and pen loops
Tuck-away back zip storage pocket for shoulder straps
Padded, side computer pocket fits up to 17" laptops (measured diagonally)
2 interior, see-through, soft monofilament mesh zip organization pockets
Unexpanded and expanded view of medium Knack (Model height: 5' 11").
Knack Medium Expandable Backpack Unexpanded for day use
Knack Medium Expandable Backpack Simple design with organization pockets
Knack Medium Expandable Backpack Unexpanded for day use
Knack Medium Expandable Backpack Simple design with organization pockets
Knack Medium Expandable Backpack Unexpanded for day use
Knack Medium Expandable Backpack in green colour
Knack Medium Expandable Backpack Unexpanded for day use in orange
Knack Medium Expandable Backpack Simple design with organization pockets in orange
Knack Medium Expandable Backpack with Separate, patent-pending, expandable packing compartment holds 2 to 3 changes of clothes
Knack Medium Expandable Backpack with Built-in, fleece-lined, protective soft case sunglasses pocket
Knack Medium Expandable Backpack with Hidden, zip-away side water bottle pocket
Spacious main compartment with organization pockets, fleece-lined tablet pocket and key leash
Exterior charger and battery pocket
Easy-access front triangle pocket with business card slots and pen loops
Tuck-away back zip storage pocket for shoulder straps
Padded, side computer pocket fits up to 17" laptops (measured diagonally)
2 interior, see-through, soft monofilament mesh zip organization pockets
Unexpanded and expanded view of medium Knack (Model height: 5' 11").

Medium Expandable Knack Pack®

Regular price $175

At home in the boardroom and on the boardwalk, the Medium Expandable Knack Pack is the perfect One Bag Life™ accessory. Learn More


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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 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 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

For orders over 10 or logo'd Knack products, please contact our Corporate Sales department: corporate@knackbags.com

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

Living a One Bag Life

Product Details

Pack Dimensions (LxWxD):

Expanded: 19"x12"x9.5"

Unexpanded: 19"x12"x4.5"

Volume:

Expanded: 31 Liters

Unexpanded: 17 Liters

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

Laptop Pocket Dimensions (LxWxD):

Dimensions: 15.5"x11"x2"

Pocket Opening: 15"

Tested to carry loads up to 40 pounds

Fabric: Suiting-inspired, custom-developed, water-resistant 1200 denier two tone polyester body fabric


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


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
  • Protective, fleece-lined internal tablet pocket
  • 2 interior, see-through, soft monofilament mesh zip organization pockets
  • Handy interior key leash
  • Built-in, fleece-lined, protective soft case sunglasses pocket
  • Easy-access front triangle pocket with business card slots and pen loops
  • Exterior charger and battery pocket
  • 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
  • Adjustable 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
  • Internal packing compression strap system
  • Large, see-through, soft monofilament mesh zip packing pocket
  • Rain flap covering expansion zipper
  • Tuck-away back zip storage pocket for shoulder straps

How to Live a One Bag Life

GET ORGANIZED

Don’t worry about your backpack being a black hole. We designed pockets, sleeves and clips that help keep your everyday items organized and in place no matter where you go.

STAY FLEXIBLE

Not sure about staying in town after your business trip ends? Unzip, expand and pack our hidden suitcase compartment with a change of clothes and be spontaneous.

BE READY FOR ANYTHING

Inspired by tailored clothing fabrics, our custom-designed, two-toned, water-resistant fabric is as much at home at a meeting with your boss as it is at drinks with your friends.

KEEP CONNECTED

Feel free to carry your laptop day and night. We designed our padded computer pocket to be easily accessible and close to your back for carrying comfort.

WEAR A BACKPACK BUT DON’T LOOK LIKE A HIKER

Our zip-away side water bottle pocket keeps your drink handy and your bag neat.

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 unzip the back pocket, unclip your straps and stow them out of the way.

HAVE FUN

Our custom-designed lining brightens up your day and ensures things never get lost in your bag.

Customer Reviews

Based on 101 reviews
84%
(85)
15%
(15)
1%
(1)
0%
(0)
0%
(0)
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.

J
J.B.
Medium Backpack Was Ideal

Finishing up a 4 day trip to Utah. Medium cube worked perfect. Also my medium backpack was ideal for a long weekend get away. Unpacked at hotel and used it for hikes in Bryce National Park.

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.

S
S.B.
The ALMOST perfect bag for the business traveler - can't wait for version 2.0!

SUMMARY: Received the Knack Bag and have now taken two trips with it. This is the nearly perfect bag for a business traveler trying to lead the #onebaglife . I gave it 5 stars because it comes close, but I really think it's about a 4.7. With a couple of minor improvements, I think perfection is in reach.

PROS: Expansion on this bag is unequaled in the market today - and believe me, I've been looking! It gives you the range to go from a svelte daily bag (17L) to an overnighter or a bag capable of toting your laptop AND your camera gear (31L). There's lots of great organization pockets and I really like the divider in the sunglass pocket so you can fit a few other items in without scratching your glasses. The water bottle pocket has a zip flap that looks great but also helps hold larger water bottles securely (like my 18oz or 26oz YETI Rambler). The bottom pocket, which seemed strangely placed, is actually great for stashing an umbrella and lint brush. The top handle is comfortable and nicely padded, and the back panels are also nicely padded. Finally, the spacious main compartment holds a LOT of daily gear. But, unlike many business backpacks, they added some nice organizing pockets in the front and rear of this compartment to held keep loose items more conveniently at hand.

CONS: As I said in my Summary, there are just a few small areas where this bag falls short. The most obvious missing feature, is a luggage pass through strap on the back for travelers who carry a pack and wheeled carry on. The top handle is great, but I wish they included a side handle for when you want to carry it briefcase-style. The laptop compartment could use a removable padding block on the bottom. The iconic front pocket with dual zippers is a little weird. The capacity and organization is great, but I'd prefer a simple U-shaped flap with dual zippers.

Overall, I'll use this pack every day for now, but will gladly buy version 2.0 if it fixes most of the small issues I mentioned!

C
C.
Does everything you need it to do.

Amazing bag does everything really well

D
D.H.
Excellent bag!

I have been using the bag for the last few weeks and keep finding additional, well thought out features I did not know about or expect. Storage is excellent! Organization is excellent! Space economy is excellent!

N
N.M.
Great Bag

Look in order to understand how much I like this bag, I bought it from Europe and Knack doesn't send it here. Meaning I had to use a service to send it. I paid 100 dollars of transportation fees + 80 dollars of duty taxes. That is more expensive than the bag itself, even then, it was worth it. This is how much I liked the bag before I bought it and still not regret it. Of course I haven't yet extensively used it, but still the materials, the design, all transmit quality. I have no doubts it will stand the test of time.

Customer Reviews

Based on 101 reviews
84%
(85)
15%
(15)
1%
(1)
0%
(0)
0%
(0)
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.

J
J.B.
Medium Backpack Was Ideal

Finishing up a 4 day trip to Utah. Medium cube worked perfect. Also my medium backpack was ideal for a long weekend get away. Unpacked at hotel and used it for hikes in Bryce National Park.

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.

S
S.B.
The ALMOST perfect bag for the business traveler - can't wait for version 2.0!

SUMMARY: Received the Knack Bag and have now taken two trips with it. This is the nearly perfect bag for a business traveler trying to lead the #onebaglife . I gave it 5 stars because it comes close, but I really think it's about a 4.7. With a couple of minor improvements, I think perfection is in reach.

PROS: Expansion on this bag is unequaled in the market today - and believe me, I've been looking! It gives you the range to go from a svelte daily bag (17L) to an overnighter or a bag capable of toting your laptop AND your camera gear (31L). There's lots of great organization pockets and I really like the divider in the sunglass pocket so you can fit a few other items in without scratching your glasses. The water bottle pocket has a zip flap that looks great but also helps hold larger water bottles securely (like my 18oz or 26oz YETI Rambler). The bottom pocket, which seemed strangely placed, is actually great for stashing an umbrella and lint brush. The top handle is comfortable and nicely padded, and the back panels are also nicely padded. Finally, the spacious main compartment holds a LOT of daily gear. But, unlike many business backpacks, they added some nice organizing pockets in the front and rear of this compartment to held keep loose items more conveniently at hand.

CONS: As I said in my Summary, there are just a few small areas where this bag falls short. The most obvious missing feature, is a luggage pass through strap on the back for travelers who carry a pack and wheeled carry on. The top handle is great, but I wish they included a side handle for when you want to carry it briefcase-style. The laptop compartment could use a removable padding block on the bottom. The iconic front pocket with dual zippers is a little weird. The capacity and organization is great, but I'd prefer a simple U-shaped flap with dual zippers.

Overall, I'll use this pack every day for now, but will gladly buy version 2.0 if it fixes most of the small issues I mentioned!

C
C.
Does everything you need it to do.

Amazing bag does everything really well

D
D.H.
Excellent bag!

I have been using the bag for the last few weeks and keep finding additional, well thought out features I did not know about or expect. Storage is excellent! Organization is excellent! Space economy is excellent!

N
N.M.
Great Bag

Look in order to understand how much I like this bag, I bought it from Europe and Knack doesn't send it here. Meaning I had to use a service to send it. I paid 100 dollars of transportation fees + 80 dollars of duty taxes. That is more expensive than the bag itself, even then, it was worth it. This is how much I liked the bag before I bought it and still not regret it. Of course I haven't yet extensively used it, but still the materials, the design, all transmit quality. I have no doubts it will stand the test of time.