Follow this step-by-step checklist to match your backpack size to your travel style and never get stuck at the gate again.
Based on: How To Pick The Perfect Travel Backpack Size by Away Together w/ Nik and Allie
Ever stood in front of your closet the night before a trip, staring at three different backpacks and still not knowing which one to grab? You are not alone, and the problem is not you — it is the way backpack sizing is sold to you.
Here is what nobody tells you: two bags both labeled 35 liters can hold completely different amounts of stuff. Brands measure liter capacity however they want — some use software, some fill bags with ping pong balls, and some just guess. And airlines do not care about liters at all. They measure in inches and centimeters. So you could buy a bag based on the number on the tag, show up at the gate, and end up paying a checked bag fee you never planned for. On a trip you designed specifically to be carry-on only. That stings.
Now imagine walking through the airport knowing your bag fits. No second-guessing at the counter, no frantic repacking in the boarding area, no surprise fees. You packed exactly what you needed for the length of your trip, your bag slides under the seat or into the overhead bin without a second thought, and you are moving through your journey the way travel is supposed to feel — light, easy, and in control.
Nik and Allie from Away Together have spent over a decade traveling out of a single backpack. They have tested countless bags across every size category, from 13-liter daypacks to 45-liter big boys, on real trips around the world. In this guide, they break down the five core backpack size categories — with real bag names, real liter ranges, and a practical cheat sheet that matches bag size to trip length. They also cover the hidden weight problem that catches travelers off guard, why opening style matters more than people think, and how to use actual bag dimensions (not liters) to check airline compatibility.
This PDF checklist turns all of that expertise into a clear, step-by-step action guide you can work through before your next purchase. Every size category, every key decision point, and every watch-out is laid out so you can move from confused to confident in one sitting. Grab the checklist and finally get this decision right.
Every checklist item comes with actionable notes to guide you — things like "Don't forget to do this before you start," "Avoid this common mistake," or "Set a reminder for 30 days out." Nothing vague, just clear next steps.
+ 13 more action items inside...
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