This is a solid product. The plastic is thick enough to stand up to reasonable abuse (such as at a game table - you probably can't drive over it). You can pick up a full box by just the lid and the lid will not come off, yet it is easy to remove the lid when you want it off. I purchased the larger size and found it holds a deck of 125 poker sized cards nicely. It might hold a few six siders with a standard deck. Based on my Mark I eyeball, I do NOT believe this would hold poker sized cards in sleeves, but it might well hold smaller sized cards in appropriate sleeves.
I'd buy this product again, and recommend it for those with a need to store decks.