Packing list envelope sizes
Packing list envelope sizes (4.5x5.5 through 10x12+) and what fits each
Packing list envelopes (also called PL envelopes, packing slip pouches, or "packing list enclosed" envelopes) are clear or printed self-adhesive pouches that stick to the outside of a carton or poly bag. Pick the smallest envelope that holds the folded document or label flat - oversized envelopes peel up at the edges in transit and snag on sortation conveyors.
Use the chart below to map standard packing list envelope sizes to the document, label, or invoice that goes inside.
Packing list envelope size chart
| Envelope size (in) | What fits inside (flat) | Common use | Shop |
|---|---|---|---|
| 4.5 x 5.5 | 4x6 thermal label folded once, single-page invoice quartered | Sub-mailer packing slip, returns label pouch, small parcel reference tag | 4.5x5.5 -> |
| 5.5 x 7 | 4x6 thermal shipping label flat, half-sheet (5.5x8.5) invoice folded once | Standard 4x6 thermal shipping label pouch on parcels, small box invoice envelope | 5.5x7 -> |
| 5.5 x 7.5 | 4x6 label plus folded packing slip together | Combined label + slip pouch, customs CN22 forms | 5.5x7.5 -> |
| 5.5 x 10 | Folded 8.5x11 invoice (folded in thirds), 4x6 label plus folded slip | Most common ecommerce SKU - holds a tri-folded invoice and shipping label | 5.5x10 -> |
| 6 x 9 | Folded 8.5x11 sheet (half-fold), 5x7 photo or insert card | Branded mailers, marketing insert pouch, returns slip + product card | 6x9 -> |
| 7 x 10 | 8.5x11 sheet folded once (half-fold), multi-page packing list | B2B shipments with multi-line invoices, wholesale orders, retail compliance | 7x10 -> |
| 9.5 x 12 | Full 8.5x11 invoice flat, customs commercial invoice unfolded | International shipments, hazmat docs, wholesale BOL pouch, full-size BOL | 9.5x12 -> |
| 10 x 12 | 8.5x11 plus customs forms together, multi-sheet invoices | International commercial invoice + CN23 packet, freight BOL, LTL paperwork | 10x12 -> |
Quick fit map. 4x6 thermal shipping label = 5.5x7. Half-folded 8.5x11 invoice = 5.5x10 or 7x10. Full 8.5x11 unfolded = 9.5x12. Combined label + folded slip = 5.5x10 (most common). For international with customs forms, jump to 10x12.
Packing list envelope FAQ
What size packing list envelope fits a 4x6 thermal shipping label?
A 5.5x7 packing list envelope holds a 4x6 thermal shipping label flat with a small margin. If you need to combine the 4x6 label with a folded packing slip, step up to 5.5x10 so the slip can fold in thirds and slide in alongside the label.
What size envelope fits a full 8.5x11 invoice?
9.5x12 holds an 8.5x11 sheet flat without folding. If the invoice will be folded once (half-fold), 7x10 fits, and tri-folded fits 5.5x10. International shipments with a CN23 customs form attached usually need 10x12 to keep the packet flat under the adhesive face.
Can I just stick the shipping label directly on the box instead of using a packing list envelope?
Yes for the carrier label - thermal labels go straight on the carton or poly bag. Packing list envelopes are for the internal packing slip, return label, customs paperwork, or marketing insert that needs to stay attached on the outside but readable through a clear pouch. They protect the document from rain, abrasion, and accidental removal during sortation.