https://www.defendapack.com/c1_a1__parcelmax_mailers/
C1 / A1 Cardboard Envelopes / Box Mailers | ParcelMax
Dec 4, 2025 - C1 / A1 ParcelMax Mailers - Our Corrugated Envelopes provide a much stronger alternative to standard hard backed and all board envelopes.
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https://packhelp.com/help/topic/what-size-of-documents-fit-in-particular-cardboard-envelopes/
What size of documents fit in particular cardboard envelopes? | Packhelp
We offer two sizes of envelopes C4 (32,4 cm x 32,9 cm) which is perfect for an A4 document and C5 (22,9 cm x 16,2 cm), which is fitting for an A5 document size.
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https://www.natuerlich-verpacken.de/Cards-A6-with-envelope-brown-kraft-paper-50-pcs
Folded cards A6 with envelopes, recycled kraft cardboard, 50pcs - buy
Eco-friendly folding cards in A6 made from recycled kraft paper, with matching envelopes, to design yourself. Find out more.
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