kexkez
DS2 has a big on roller type wheel plastic storage container. it has a plastic hinge lid and I always called it his treasure chest. It seemed liked a good idea at the time but it was so big getting anything out of it was a struggle and because so much fitted in it it meant everything came out to get stuff from the bottom. Smaller crate type boxes work better. With lids if you can get them. You can have different ones for different toys. if you get differing colours he'll soon know the red one is cars, the blue one is blocks, the yellow one is... etc. plus you can put a picture on the front of each.
This is a great suggestion, I think I will use this idea too