Heavy duty multi purpose case. 500mic. Oversize B4. Bag size is 40.5 x 28cm/15.9 x 11 inch. B4 size is: 35.3 x 25cm/13.9 x 9.8 inch. Reinforced material, water resistant. 500 microns. Assorted colour zips. Transparent with assorted colour zips. Colour will be selected at random unless specified in the comments section at checkout.