But what if you have neither? Can you use any kind of bag, like a backpack, as a carry-on? Yes, but it depends on the weight ...

Size and weight still matter. If you desire more creature comforts or more gear, or if you plan to be away for a long time across multiple climates, you should choose a bigger travel backpack.

with many calling it the “perfect size” while praising its “well thought out” design. Get It This Filson duffel bag-backpack combo combines the classic looks of the brand's storied bags ...

The bag can be both expanded and contracted beyond this size, in case you do some shopping along the way or want to use it as a daypack. In its non-expanded form, this carry-on backpack is also ...