All Monoflo bulk containers fold for highly efficient stacking when not in use. Monoflo’s unique, welded base provides structural integrity that outperforms the competition... test after test. The “Flex-Hinge” design is a completely protected hinge which contains no fiberglass or metal allowing for easy assembly and disassembly. 4-Way forklift access allows mobility and accessibility. Bulk Container Lids are sold separately.