We use flip top totes like this:
http://www.homedepot.com/p/12-Gal-He...-001/203664499 for larger item storage, and
The 13 gallon Sterilite containers with removable tops, and the 13 gallon light duty totes are both not durable enough.
The totes provided by FIRST with the KOP (aka the 2015 game piece) weigh too much when they're full (injury risk), so we use them primarily for back stock storage.
We designed and built two RoboStore carts that we use to move our build materials to/from our storeroom:
https://www.chiefdelphi.com/media/pa...9f23e9ebd7914&