The zippered storage box appears, at least in the picture, to be sturdy enough to stand on its own.  This is not the case.  It’s very flimsy.  The jumbo size is particularly awkward.  Also, the zipper has 2 pull tabs, which would have been helpful if they had met in the middle.  However, one is at the far left of the bag and the other is about 4 inches from the opposite side.  When I tried unzipping, the zipper separated.  Very odd.  I managed to get it closed, but I don’t expect the bag to last very long.