my company were disposing of out of date jointing resin kits, these come with a resin that is mixed with very dry sand, and came in tubs, approximately A4 size and about 3" deep, there were also buckets that held 10 litres of the same stuff.
I must have had about 50 or so of the big buckets, and several hundred of the smaller tubs, great for storage, I still have about 4 stacks of the tubs nested inside each other and about 4 foot high, all sitting in the garden, waiting to be used, with the lids on they stack well and are used for storing a lot of things here. tools, fixings, model bits, china, you name it we have it stored in tubs.