"If you’re looking for a bag to replace all bags...this is it."


Medium Expandable Backpack

Large Expandable Backpack

Small Expandable Backpack

New Expandable Backpack

New Expandable Backpack

We want your bag to work for you. That’s why we created our Knack Packs in a few sizes. While each size bag shares many of the same great features, there are a few differences between them which we outline below.

Packing Dimensions
Medium Large
Medium Knack Backpack Unexpanded 17 Liters
17 Liters
Large Knack Backpack Unexpanded 22 Liters
22 Liters
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
2 lb 11 oz 3 lb 4 oz
Laptop Icon
15" 17"
Plane Overhead Icon
All Jets All Jets
Plane Under Seat Icon
Under Seat
All Jets Doesn't fit (when expanded)
Outfits Icon
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



Model: 5'11"

Knack Backpacks on 5 foot 11 inch model



Model: 6'3"

Knack Backpacks on 6 foot 3 inch model



"Go, explore the unknown. Get lost, find your way back. It’ll change you and the way you experience life."


Everday Bag + Expandable Suitcase

"Innovation at its best. "
- Jonathan O..

Laptop Backpack
Hidden Carry-on =
One Bag Life

Professional styling for the office

Slim & lightweight for everyday use

Unzip & expand for more space

Separate hidden section for travel

Backpacks Built for One Bag Living


When the usual methods failed, we custom-engineered the manufacturing process to attach our top handle and back straps to the backpack. We then filled the bag with over 30 pounds and jerked it up and down more than 3,500 times before we were confident it wouldn’t let you down.

Exhaustively-Tested Zippers

Not only did we test our YKK™ zippers and custom zipper pulls for strength, we also opened and closed them 5,000 times to make sure they would last.

Durable Buckles and Hardware

We crafted our bags using only durable, easy-to-use Duraflex™ Hardware.

Above and Beyond Details

We sweat the little things. Most bags are constructed using 5-6 stitches per inch in the seams. We use 7 stitches per inch. It costs a bit more, but we think the added strength is worth it.

Knack In the News

The best backpack for when you don’t want to look like a backpacker.

Comfortable, durable, versatile, and lots of space.

The versatility of an everyday commuter bag with the convenience of a travel backpack. It’s for the office worker who has an adventurous streak.

It effectively combines a business bag and airline-compliant luggage. If you love traveling light and brilliant design, the Knack Bag is for you.