This Polypropelene back comfortably stores 15 cans upright however more cans are possible. You can store your caps in a reliable easy to find place with the discretly located inner zip-up pocket. The outer open pocket also allows for blackbooks, sketches or markers to be neatly tucked away yet easily accessible. The final touches are 2 small recognisable dangerous goods logo's printed on one exterior side of the otherwise all black bag.