I was trying to get a Jansport Action Pack for my kids as the picture of it I saw on the internet looked great, but these packs aren't distributed in Europe.
Try having a look at the Jansport website, and see if you can find a picture of the Action Pack 40828
Action Pack 40828. It's a nylon waist pack, the pouch has a zipper top and a front pocket, it measures s6.5 x. 8 x 3.5 and contains about 100 cu in. Cost is about $20 including 22 oz water bottle. I know this would have been just the business for my kids, but I don't think it would be right for me as I have to carry extra stuff to the kids - "Mum, where's the sunscreen; Mum, have you got a band-aid;" etc.!
Good luck.
Sandra