I have umpteen of them Lizbethann. 3, 9, and 18 litre sizes
I started with a couple of 3 litre. They are the most wonderful storage boxes. Stack well and also store neatly on my shelves in the house and on my chrome shelving garage shelves. I was never obsessed, I bought them for their practicality
I bought all the bigger ones prior to my last house move, I labelled all of them and they went straight onto the appropriate shelf in my new home. I make a contents list and tape it on the inside, easily seen from the outside, so I can go straight to any tool or fixing or anything else needed from my garage
My craft room is very tidy because of them and so is my summer clothing, stored neatly in the 18 litre ones, under my bed
I got mine from bigdug and I also got my modular chrome shelving from there, 17 years ago. The chrome shelving came apart and I brought it to my new house in my car, assembled it and it was ready for the boxes to be stacked