Sterilite has lots of containers in all shapes and sizes, with and without attached hinges:
http://www.sterilite.com/
Your can research styles and sizes here, and shop at Amazon and other sites more easily using the Sterilite model numbers.
For instance, we have a bunch of these 1805 Flip Top hinged smaller clear boxes, and multiples of these stacked up fit in lots of places in our FC20:
http://www.sterilite.com/SelectProdu...=249§ion=1
Specifications tab shows dimensions etc.. Amazon had these on sale last year with 6 to a box for $19 as I recall. [now $22.23 for 6!]
Sometimes a larger bin will fit in the bottom of a storage area, and a smaller bin will stack on top, because of the AS's curved shape at eye-level for upper cabinets (of which our FC20 has tons).
Good luck!
Peter
PS -- If you search for "Sterilite" in the Google-powered search box above with the blue border, many other threads/posts will give you some other ideas for different mfg. and so forth.