Harbor Freight's 5-gallon bucket is for more than just carrying tools and holding materials. ... Use a Harbor Freight bucket lid or a piece of flexible material to create a slide-like shape inside.

Now Gamma has a snap on adapter that allows you to put a lid on any 3.5 to 7 gallon bucket. Just snap it on, spin on the lid and you've got an easy-opening, inexpensive, spill-proof container.