double boxing for ebay?

I have a pair of shoe's im looking to sell on ebay. Id rather just sell them with the original box, but how do i go about doing that?

should i double box it or ship it with some type of envelope or something? I am unsure if there is a flat rate box that fits a roshe box in it?

thanks guys.

You need to double box inside another box.

Most shoe boxes won't fit insde the flat rates