Also useful - the plastic bins that cat litter, cat food, and laundry soap come in. I've used them for waste baskets, food storage and transport, and fabric storage.
Years ago, I had some round plastic containers with tight fitting lids. I used one for a flour canister (larger than the rubbermaid ones), and the other to store my 2.5" squares in for making 9 patch blocks. I think it still has some in it.