Hi,
I think most folk in the UK use Really Usefull Boxes ( RUB's) - I seem to remember the 33L being mentioned for males and the 50L for big females?
I am using the Komplement wardrobe drawers from Ikea for my adult females in the main rack but they may be slightly larger than needed to be honest.
But for the grow out racks I am actually using these as I could get them really cheap in poundstretchers at the time.
They are slightly smaller and you definately couldn't keep a decent sized female in them though.
I don't know if either location will deliver but you might be able to find the product in a store relatively close.
dr del