Sterilites from Target are 34 3/4X16 1/2X16
Rubbermaids from Wal Mart are 29X18X6
Sterilites 40QT's from Wal Mart are 26 1/8X18 1/4X6 3/8
Maybe more sizes, but I use the top one myself.

Use 3/4" melamine.

There are some rough figures for you.