JanSport has a lifetime guarantee on their products. I've picked up a couple of book/day packs at garage sales for a total of $1.25. My son has been using the $1.00 one for a couple of years at school.

I had to send the 25-cent one back to JS to have the zipper replaced (which added about $2.50 to the cost). It came back good as new, & it's used frequently as a catch-all bag.

David