if you are moving around a lot and backpacking around the world, it is far better to have a proper cheap messenger bag. They are simply more versatile, easier to carry up flights of stairs, pack into tight places, and overall, they just make life simpler. I don't need to pick them up when getting on the escalator or gobanneybag them up a flight of stairs or across streets. Help you quickly understand the basic performance of the backpack. I prefer backpacks. Here is the basic information of backpacks for you to buy quickly.
Osprey Atmos AG 65 Pack5. Osprey Atmos AG 65 Pack
This is a heavy-duty pack designed to evenly weight, and it comes with 3D suspension so that you have better upper body mobility.