Packing List Envelopes in Inches: US Sizes and Metric Equivalents

In short: US 4.5 x 6 in ≈ 11 x 15 cm, 5.5 x 10 in ≈ 14 x 26 cm, 7 x 10 in ≈ 18 x 25 cm, 9.5 x 12 in ≈ 25 x 33 cm (fits US Letter flat); a 4 x 6 in shipping label needs 14 x 18 cm.

American distributors list packing list envelopes in inches (width x length, outside dimensions), while European and Turkish manufacturers use centimetres based on A-series paper. The table below matches the most common US catalogue sizes to the nearest metric pouch we produce, so you can switch suppliers without changing how your documents are folded.

US size → metric equivalent

US size (inches)	In cm	Nearest metric pouch	That pouch in inches	Note
4.5 x 5.5	11.4 x 14.0	11 x 15 cm	4.3 x 5.9	Slightly narrower, 1 cm longer
4.5 x 6	11.4 x 15.2	11 x 15 cm	4.3 x 5.9	Practically the same size
7 x 5.5	17.8 x 14.0	14 x 18 cm	5.5 x 7.1	Same footprint
5.5 x 10	14.0 x 25.4	14 x 26 cm	5.5 x 10.2	Same width, 0.6 cm longer
6.5 x 10 / 7 x 10	16.5–17.8 x 25.4	18 x 25 cm or 18 x 26 cm	7.1 x 9.8 / 7.1 x 10.2	Holds half-letter or A5 flat
7.5 x 10	19.1 x 25.4	19 x 26 cm	7.5 x 10.2	Same width
9.5 x 12 / 10 x 12	24.1–25.4 x 30.5	25 x 33 cm	9.8 x 13.0	A little longer; US Letter and A4 fit flat

Which pouch fits which US document?

4 x 6 in shipping label (10.2 x 15.2 cm): 14 x 18 cm. The 11 x 15 cm pouch is too short for it.
Half-letter packing slip (5.5 x 8.5 in, 14 x 21.6 cm): 18 x 25 cm or larger.
US Letter folded in three (8.5 x 3.7 in): 14 x 26 cm.
US Letter folded in half (8.5 x 5.5 in): 18 x 25 cm, 18 x 26 cm or 19 x 26 cm.
US Letter flat (8.5 x 11 in) and commercial invoices for export: 25 x 33 cm.

Buying metric pouches from overseas

Our pouches are made in Istanbul and priced per piece in USD at the daily exchange rate, with minimum orders from 1,500 pieces depending on size. Freight to the United States is quoted per order, and the importer is responsible for US duties. Current prices are on the price guide.

Frequently asked questions

What is 4.5 x 6 inches in cm for a packing list envelope?

4.5 x 6 inches is 11.4 x 15.2 cm. The nearest metric packing list envelope is 11 x 15 cm, which holds an A4 or Letter sheet folded into quarters.

What size packing list envelope fits a 4 x 6 shipping label?

A 4 x 6 inch label is 10.2 x 15.2 cm, so it needs a pouch of at least 14 x 18 cm (5.5 x 7.1 in). An 11 x 15 cm pouch is slightly too short.

Is there a metric equivalent of a 9.5 x 12 inch packing list envelope?

Yes. A 25 x 33 cm (9.8 x 13 in) pouch is the metric A4 size; it is a little larger than 9.5 x 12 in and holds US Letter or A4 documents flat.

Last updated: 27 October 2026 · Packing Envelopes, Istanbul

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