Hello, Poshers!

As you can probably tell, I am rather new to the whole shipping/Poshing game and frankly was not expecting to sell anything (I haven't even opened the app for weeks as I've been busy with grad school and preparing to move). However, I somehow did and now I have to figure out the box situation.

I don't really want to order a whole pack of boxes from USPS, and the item I sold is pretty small (a wallet), so I'm thinking my best bet is to reuse a plain brown box? I found one that would be pretty perfect except that the shipping label won't fit on one side...is it possible to get a single USPS shipping box and if so, what size? I looked at Regional Rate Box - A1, that seemed to be the smallest but is still way bigger than I'd need.

I'm sorry for such a long post but I'm a little nervous about doing this all wrong.