When you have lots of cards to take the average leilleur losing them and keep them in small packages which "fly". Here it is not the case. 8 slots for SD and compact flash for four (less compact). A seal ensures the cards against moisture and the hull is solid. I will not throw it against the walls as did another client, nor bring him into diving because underwater inutile.Toutefois is the only resistance to closure because of seal denotes strength and protection against rain and moisture. Perfectionists are even room for a small pouch against moisture (compact flash slot). The size is exactly that it takes for the box is not lost in a tote (A small notebook without taking the place of a book). I recommend.