Knack Bag Review: The Best Carry-on Bag

If you’re looking for one bag to take with you traveling, it’s the Knack Bag. The Knack Bag is all about only needing one bag, for anywhere you’re going. The Knack Bags are expandable, which means you can fit a lot into these bags!

We’ve been using our Knack bag as our carry-on bag for almost a year now, and love how versatile it is.


Knack provided the Series 2 as a sample for review. We’re grateful for the opportunity to test the bag and we always publish our honest opinions, whether positive or critical. We use an affiliate link in this review.

The Series 2 Medium Knack Bag Details

  • Holds 24 Liters when unexpanded, up to 35 Liters when expanded
  • Weighs only 3 pounds
  • Fits in the overhead compartment and under the seat in front of you, on all jets
  • Holds a 15″ laptop
  • Fits a 24 oz hydroflask
  • Comfort foam shoulder straps that are stowable
  • Water resistant material
  • Tested to hold up to 40 pounds

Storage and Organization of the Knack Bags

I think the best feature of the Series 2 expandable knack bag is the organization. There are so many compartments and pockets, which means you know where everything is. The front pocket has a few small open pockets, pen holders, and a key clip, plus a zipper pocket which is perfect for your headphones or passport. The front pouch is great for all the necessities that you need, iPhone, iPad, book, wallet, pens…it’s all easily accessible.

The main compartment has 2 mesh pockets, plus a fleece-lined pocket. If you like to pack a lot, you’re going to love the suitcase compartment, which has a packing capacity of 11 Liters.

There is a padded computer compartment, a hidden water bottle compartment, and even a secret zipper compartment.

The series 2 has a top handle and a side handle. The backpack can be turned into a duffel, by untucking the shoulder straps and tucking them away.

knack bag expandable suitcase

The Different Knack Bags

Knack Bags have all kinds of various size expandable backpacks, anywhere from 27 liters-46 liters. Knack bags also has a convertible duffel that can be worn on your back, or carried like a duffel bag. The duffel holds up to 40 liters, which is a week of clothes! And if you’re looking for a small bag to take with you on the go, the expandable cross-body bag is perfect. This bag is just big enough to hold the essentials, including a tablet, keys, book. Check out all the different travel bags that Knack has to offer.

I tend to pack a lot of stuff, but the bag feels great, and shoulder straps are comfy. We’ve only been using Knack bags for about a year, but we love that the company is always trying to get customer feedback, and improve their products based on the feedback.

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