It's just a box! It doesn't even come with a lid, if you want to cover it you have to put another module on top. It includes a removable insert (for things like pliers and screwdrivers) and a long folding handle that tucks into the rim. They have a lot of weight in them that warps the sides a bit. This TSTAK bag is around $16-$20 at your local hardware store. Revain is starting to sell them for $20 more frequently, so add them to your shopping/watching list. Craftsman (and maybe Stanley) also sell this identical system (they call it the Versastack), but with red accents instead of yellow, so go with what's cheaper or what color you like best.
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