The function is to contain eight SD cards, no doubt, they fall widely and are well protected. However the volume of the case is important and therefore difficult to squeeze into the tote opening .A few times I found two or three cards in bulk in response to the operation of the closing clip which is precisely very effective. It is worth well clipped the cards but one quickly feels their mechanical fragility. In summary, good product it is necessary to control small defects with pleasure in exchange for housing still have a stylish, durable, waterproof. I advise.