Nestable and stackable totes are reusable containers designed to make warehouse storage, picking, packing, and transport more efficient. When empty, they fit inside one another to reduce the volume needed for storage or return shipping. When loaded, they stack securely so goods can move through a warehouse without wasting vertical space.
This matters because tote design affects labor time, storage density, product damage, and transportation cost.
Key Facts
- Cube utilization = used volume / available volume
- Nesting ratio = nested stack height / un-nested stack height
- Stack load limit = maximum safe weight supported by the bottom tote
- Total stack weight = number of loaded totes x weight per loaded tote
- Space saved = original volume - nested volume
- A stable stack needs aligned rims, even loading, and a center of mass inside the support area
Vocabulary
- Nestable tote
- A tote shaped so empty units can slide partly inside one another to save space.
- Stackable tote
- A tote designed so loaded units can sit securely on top of each other without crushing or slipping.
- Interlocking lip
- A shaped rim or edge that helps one tote align with and grip another tote during stacking.
- Pallet footprint
- The area covered by a pallet, commonly used to plan how many totes fit in a storage or shipping space.
- Load rating
- The maximum weight a tote or stack can safely support under specified conditions.
Common Mistakes to Avoid
- Confusing nesting with stacking is wrong because empty totes nest to save space, while loaded totes stack to support weight.
- Ignoring the stack load limit is wrong because the bottom tote may deform, crack, or fail if the total weight above it is too high.
- Stacking totes with uneven contents is wrong because an off-center load can shift the center of mass and make the stack unstable.
- Measuring only floor space is wrong because warehouse efficiency also depends on vertical height, aisle access, pallet fit, and handling time.
Practice Questions
- 1 A warehouse has 120 empty totes. Each tote is 0.60 m tall when stored alone, but each additional nested tote adds only 0.08 m of height. What is the height of one nested stack of 120 totes?
- 2 A loaded tote weighs 18 kg. The stack load limit for the bottom tote is 180 kg above it. What is the maximum number of additional loaded totes that can be placed on top of the bottom tote?
- 3 A team wants to stack loaded totes higher to save floor space. Explain two design or loading conditions that must be checked before increasing the stack height.