standard shipping envelope

[antiquehokie]

Can you use an envelope size 5" x 7" with a cardboard insert for trade cards less than $20 and 3 oz?  Ebay recommends their 6" x 8" paperboard mail jacket, would it be the same as the cardboard insert?  

[nobody*s_perfect]

Those dimensions are within the limits that are specified on the Help page.

https://pages.ebay.com/seller-center/shipping/ebay-standard-envelope.html

[antiquehokie]

but is it ok to put cardboard inside?

[tdrake]

---

@antiquehokie wrote:

but is it ok to put cardboard inside?

---

As long as the envelope doesn't go over 1/4" thick and 3oz and is at least slightly flexible.