Collapsible
Folds down flat or into a smaller form when empty.
Where nesting relies on shape, collapsing relies on hinges, folds or a knock-down structure. Both solve the same problem — empty volume — and both add a handling step, so the question is whether the space saved is worth the labour to fold and set up.
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How 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.
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Educational content. Not engineering or regulatory advice — confirm ratings and specifications with your supplier and the applicable regulations.