Please click here to review the Proposition 65 warning associated to this item.
Yes, the Casters on this Winco Ingredient Bin are removable and replaceable. The product dimensions listed include the 3 inch casters.
Unfortunately, this Winco Ingredient Bin does not have any labeling regarding BPA.
This ingredient bin holds 21 gallons. 50 pounds is equivalent to just about 6 gallons, so you should have plenty of room!