Perfect size for Kindergarten to 3rd grade so kids can fit full size papers and folders without being overwhelmed by a huge pack. Fits my 33 lb. son and could be used by a much older child.

UPDATE: Purchased Aug 2012 and it is Nov 2013 and 2 of the zippers have broken off completely. I just got a Fjallraven Kanken (from Amazon)to replace it because I want quality that lasts years and they last forever. If you buy new packs frequently go for it, but I would rather pay a little more for a pack that will last years. The Kanken is actually a better size for my small 1st grader. Kanken was designed for school kids in Sweden in 1978, and have been used by kids (and adults) in Europe ever since. I have one that I use instead of a purse and I love it.