Is this acceptable with Bubble Mailer?

[damonl00]

 and then I write details over the index card, then stamp, then tape it to the bubble mailer.

I have to do this because there’s sharpie under the bubble mailer.

[a_c_green · Accepted solution]

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@damonl00 wrote:

I have to do this because there’s sharpie under the bubble mailer.

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You should be fine as long as you tape the card down around all four edges. Tape over the address if your pen is water-soluble.

Having said that, it looks like you have a #000 envelope there, which is large enough to hold a standard 4"x6" eBay mailing label, so why not just buy the label through eBay and print it out that way? It will also cost you less in postage than buying stamps over the counter, and your tracking number will be automatically uploaded to eBay for you.