Here is what I think he's referring to for the plastic bin...IBC Tote
Standard size is 275 Gallons (if my calculations are correct this equals 36 cubic feet)
Sometimes 330 gallon sizes can be found.
I buy mine (275 G) at auction for cheap...$15.00 - $40.00 each.
Since I have a walk out basement where my Axeman is, I built a doghouse and slide gate affair into all of the totes.
Then I use a pallet jack to move or change-out totes at the Axemans auger as needed.
And during the off season I move out the tote to not have it in the way for more space.
Still working on a method to tilt the tote to let gravity take the last amount of coal towards the Axeman's auger.