As someone who is inexperienced with selling on eBay, I want to thank everyone who has contributed their advice to this thread.
This is a very simple question, but I was wondering, for shipping shoes--new in box and new without box--what size of USPS boxes does everyone use? I found the medium flat rate boxes (Priority and Express) to be too small (11" x 8.5" x 5.5") and had to use a larger one (Priority 12" x 12" x 8").
Shoes without a box are easy ... https://ecom-prod.usps.com/store/browse/uspsProductDetailMultiSkuDropDown.jsp?productId=P_0_SHOEBOX&categoryId=subcatMSS_B_Free
Shoes with a box can be a litter harder. Small shoes you can actually fit the shoe box into that USPS box. Otherwise, I usually just use a separate brown box and ship them Priority Mail. I find flat rate boxes dont work with shoes very well.