Design & Materials: They typically feature a rugged, heavy-duty polyethylene (HDPE) outer shell with a polyurethane foam insulation layer and a stainless steel inner liner.Key Features:Heavy-duty metallic locking latches to tightly secure the airtight lid during transit.Sturdy, fold-down side handles for easy lifting and high portability.Stackable design allowing multiple sizes to nested or stacked securely on top of each other.Capacity & AvailabilityThese commercial barrels are typically sold in multi-piece sets or individually, varying by size capacity: