The material of these bags is amazing, soooo easy to keep clean, any marks just wipe off with a damp cloth! The zippers are are really easy to open, which is really good so kids can get things in and out by themselves. I have 3 littles ranging from 1 to 5yrs and these are hands down the best backpacks I’ve found and the size range is fantastic! Plus they have the sweetest prints, what’s not to love!? 😍