Specify Size & Construction
Mattress Bag Size Guide: Why Bigger Is Not Better
A practical method for converting mattress dimensions, loading direction and closure allowance into a workable bag specification.
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Convert finished mattress dimensions, loading direction and closure allowance into a fit-approval brief.
A mattress bag that is too small is obviously a problem: operators struggle to load it, corners stretch the film, and the seal or adhesive flap may not reach its intended position. But a bag that is simply made much larger is not automatically safer. Excess film can fold under the mattress, catch during handling, hide the closure area and increase material use without solving the real fit problem.
The correct specification begins with the finished mattress and the packing process.
Start with three finished-product dimensions
Record the mattress width, length and maximum thickness after quilting, edge finishing and any final expansion. Do not rely only on the commercial size name. “Queen” or “King” can vary by market, product line and construction. The factory needs numbers and units.
Measure more than one finished mattress when normal production variation is possible. State whether the dimensions are maximum values or nominal values. If a topper, pillow top or compressed edge changes the profile, show that in a photo or drawing.
Define the bag measurement convention
For a side-gusset bag, clarify whether the quoted width is the flat front-panel width and whether the gusset is stated per side. A notation such as 1,600 mm + 2 × 250 mm gusset × 2,600 mm length is much clearer than “2,100 mm wide.”
The same rule applies to imperial dimensions. A reference such as 60 in width × 15 in gusset × 90 in length must say whether the 15 in value is one gusset depth or the total expanded depth.
Include the loading direction
The bag allowance changes depending on whether the mattress enters from the short end or the long end, whether it is loaded manually or with equipment, and whether the mattress is flat, folded or compressed.
Ask these questions:
- Which end of the bag is open?
- Where is the bottom seal?
- How many operators load the mattress?
- Does the bag move across a conveyor or table edge?
- Is the closure adhesive, heat sealed, taped or folded?
Allow for closure, not just fit
The bag needs enough length for the chosen closure. An adhesive flap requires a defined flap depth and tape position. A heat-sealed opening needs a clean seal area. A folded or taped end needs enough excess film to close without pulling the corners tight.
Extra allowance should be intentional. It should not be added as an unexplained safety margin.
Treat reference sizes as a starting point
Common reference dimensions are useful for discussion. OnPacking's controlled product data includes examples from 39 in × 8 in × 86 in through an oversize 78 in × 18 in × 115 in, shown with metric conversions. These references do not replace fit approval.
Approve with the actual product
For a new mattress model or packing method, test a sample bag on the finished product. Check loading force, corner stress, closure position, excess film and the way the packed mattress is moved.
The most useful RFQ therefore includes the finished mattress dimensions, bag measurement convention, loading direction, closure, film thickness and a photo or drawing. Bigger is not better; a controlled fit is better.