Postal Letter

What USPS Flat Rate Box Will Fit a Pair of Shoes?

I am planning to sell a pair of Asics shoes (Men's size 9 & 10) on eBay and I was wondering which USPS flat rate box would fit a pair of shoes (small, medium, or large?)

Public Comments

1. http://search.yahoo.com/search;_ylt=AhrTec77lAgP7fEvB65xDfGbvZx4?fr=yfp-t-944-s&toggle=1&cop=mss&ei=UTF8&p=usps%20flat%20rate%20shipping
2. go to the USPS website for the dimensions of the boxes