If framed like the wall of a house, with top and bottom plate with studs on 2' centers and sheethed in 1/2" plywood you will have enough strength to keep the walls from bulging or bursting. Be sure to put the plywood on the inside of the wall, not on the outside. Otherwise the weight may push the plywood off the framework. Also you will need to keep the walls from spreading apart. I plan to build a bin on my concrete slab garage floor, but do not wish to drill anchor holes in the floor. I will run 2X4s from one side to the other at four foot intervals at floor level and across the top. I am planning to use 4X4 uprights every four feet (instead of 2X4 studs every two feet), and make them 6 feet high so I can run a cross-brace from one side to the other, and be able to walk under it. My bin will be 4' wide, 4' high sides, and 12' long. I think that any bin of this width and height, longer than 4' will need to be tied together side to side, top and bottom.