Alright so if you want to use a Kanken for school and you usually take a lot of things home your back Is gonna hurt and your shoulders because the straps don't have the cushion things so it drags your shoulders down. Make sure you don't get it dirty because it is hard to clean it since you can't just put it in the washer. To clean it you use like a wet towel and scrub it. Hopefully this is helpful and don't follow me