Right in between Sticky Lemon's small and large backpacks you will find this medium size. It has an extra pocket on the front, waterproof lining with a hand-drawn pattern and adjustable shoulder straps with a chest strap. On the inside you'll find an elastic band that serves as a bottle holder and a pocket all over the back that closes with velcro. There is also a name tag to put your info. Dimensions: body - 23,5 x 13 x 32 cm front pocket - 19,5 x 9,4 shoulder handles - adjustable to a maximum length of 67 cm elastic band inside - 2,5 x 11 cm Materials & Care: body - recycled PET bottles handle - cotton zipper - matt white YKK lining - waterproof nylon buckles - matt white metal Oops, a stain in your Sticky item! We would advise you to treat it with just a slightly damp cloth. That will do the trick! We wouldn’t advise you to clean it in the washing machine or to use any severe cleaning agents.