Tom, i used these expensive detailing storage things in the past and they almost always are dissapointing!
The best thing i have found are plastic boxes. Now the boxes i use are the ones you would find the in gardening section of B&Q etc. They are normally cheaper than the ones in the "storage" section and they are much sturdier.
They are normally solid plastic, not opaque. The opaque ones are normally very flimsy and brittle, and can cost up to £15?!
the ones i use are normally green, to go with the gardening items too. and normally cost about £6-7
hth