I get my containers from work for free, 2.5 gallon & 5 gallon plastic chemical containers. I just start this penny hoarding last month and have 70 lbs so far in a 2.5, it should hold around 100.
For Optimum Cu cent Storage....use a 55 gallon open head drum....poly or steel doesn't matter....for the amount of storage it takes very little square footage but make sure you park it where it can remain for a very long time....once full it could be pushing 1000 lbs. My barrel o pennies is getting fuller
I just noticed on Ulines website that the 4 gallon square pals have a weight capacity of 36 lbs. $50 in pennies will weigh about 30 lbs, so doesn't the handle break? Also when they are almost full (or even half way full) are they heavy and hard to handle?