This pack is a really good combination of cute and functional for our almost 4 year old girl. She's been using it for day hikes for about 6 months and just took it on her first overnighter. It fits her tiny frame well, yet still holds enough to let her carry her personal items, like a jacket, snacks, and a couple toys. The side pockets hold a small water bottle well, but are also perfect for smaller items like sunglasses or a head lamp, and since they're velcro she can open and close them herself. And the pack even has a hydration sleeve where we could stash a 2/3 full 1 liter Platypus bottle. Getting to "drink from a straw" like Mom and Dad meant more hydration on the trail and less stops for water breaks. She probably wont get more than another year or two out of this pack before she's ready for something bigger, but it's totally worth the small investment in my opinion.