This backpack is fabulous because you get a 2 in 1.  You have the large backpack and it comes with a fun detachable fanny pack if you don't want to lug the whole backpack around. It's a great stylish addition to your collection.  The camo style is fun being that it's Pink, Green and Black. 
Measurements: Medium Size Backpack is 12"x16"x6" 
Fanny Pack is 9.75" x 7" x 2".  with adjustable strap that measures up to 44" Fits all xs - xl
Material is Nylon with a comfortable cavas padded black strap