Choosing a backpack sounds simple until you're standing in an airport with a strap digging into your shoulder three hours into a layover. The right bag changes how a trip actually feels, and it doesn't have to cost a lot to get it right. That's why more travelers are searching for affordable travel backpacks online instead of settling for whatever's on a store shelf nearby.This guide covers what makes a travel backpack worth the money, what to check before ordering one, and where California trav