Pottery Barn Kids has the a modern white small bin for $9.99
. Reg. $69.
Free shipping with promo code NICE
This bin is made to hang on the wall (see photos).
I don't think it comes with a mounting rail, but surely creativity could make this work.
Dimensions: 22" wide x 7.25" deep x 8" high
Maximum Weight Capacity: 33 pounds
I know this deal is rather obscure; hope it helps someone.