Let's break it down into the three most important things you need to think about: size, material, and weight.
Size:
The first thing you'll want to do is figure out what size bag will work best for you. Some backpacks have adjustable straps that allow them to fit on anyone. Others have only one size and don't adjust at all. Make sure you know what kind of bag you're looking at before buying—you don't want to end up with something that doesn't fit!Material:
The material used in making backpacks can vary widely from one brand to another, as well as within brands themselves depending on the type of bag being offered (or even within different styles from the same brand). For example, some materials are more durable than others but also heavier; some are lighter but not as strong or long-lasting; some are waterproof backpack while others aren't; some are made from synthetic materials while others are natural fibers such as cotton or wool (both have pros/cons).The key in choosing a good travel backpack is to find the right balance between convenience, comfort and durability. No backpack can be all of these things, so you should focus on which ones you think are important. As long as it has everything you need, it doesn't matter if it's not particularly stylish. And with the huge variety available today, there's a backpack out there for everyone.