I have for sale these shipping/storage boxes they are made from realy strong plastic, fit inside each other when empty and stack ontop of each other when the lids are closed.
I have used them for storage,sending stuff in the post, moving chics, bsntams, ducklings etc ( i drilled lots of holes) and even plant pots i cut 2 holes in thr lids whith s hole saw and grew tomatoes in them and it stop the soil drying out with the lids shut.
They are far better than any from the shops and i sell them for £7 each or £60 for 10 they can be bought new online for £30 each