The body narrows toward the base, so an empty conical drum drops into the one below it. Full drums stack and ship as normal; empty ones take a fraction of the space on the return leg or in storage. That single geometry change is what makes reuse and empty return practical for a format that is otherwise mostly air when empty.
Where you meet this term
You may also want to explore
What is a conical steel drum?
A tapered steel drum that nests when empty, so the empty leg stops costing what a cylindrical drum costs.
LearnWhy are some drums tapered?
The taper is not styling. It is what lets empty drums nest instead of shipping air.
LearnHow do empty containers affect freight cost?
Rigid packaging is efficient in one direction. The other direction is where the money leaks.
TermNestable
Empty units sit inside each other, so empties take much less space than fulls.
TermReturnable packaging
Packaging designed to come back and be used again, usually within an agreed loop.
TermOpen-head drum
A drum with a fully removable lid, closed by a ring and clamp.
If this becomes a real requirement
CAQUIN sources industrial packaging to specification. Send what you use today, roughly how much, and where it ships — a photo is enough to start.