Sorry, but not a "B"
Sometimes depending on distance a "Flat Large Rate Box" can be cheaper. For instance.
Large Flat Rate Box = $15.30 paid online
Regional Rate "B" Box ranges from $6.16 to $16.13 depending on distance
The majority of the time you are better with a Regional Rate B vs a Large Flat Rate unless you are shipping cross country.
You need to order your Regional Rate Boxed online and also print the shipping labels on ebay or usps.com
Here is the link to order boxes, they are free so no downside to having a few around. I use "side loading" for about 95% of my jacket/suit shipments.
I figured it wasn't the regional box that you recommended when the option came up on the kiosk screen but the pictures for regional and flat rate were the same and everything was already packed so off it went for $16.75-ish. It's for a family member and I may never recoup any of the costs so it's not a big concern this time. I couldn't find any boxes marked "regional" and this one had a "B" on the label so I rolled with it.
Thanks for the link to the other boxes. I may be shipping more down to him in the near future.
DC to Texas would only be about 1/2 way so you would have been better with the B (just for your own info), not that it matters at this point, but yea, def order up some boxes, you can print the labels at home, tape them on and either drop the boxes at the post office or just leave them for your mail carrier to pick up. Super simples and def a money saver in the long run.
Why would you choose this over the Legal Flat Rate for pants? Never had a pair of pants that didnt fit in a flat rate envelope. I can usually even get 2 pair into one flat rate envelope if they are nice wool dress pants vs cotton chinos. Legal Flat Rate is larger and costs less.
Plus I've never shipped a shirt any other way except for 1st class mail. Save about $2-3 per shirt by using 1st class vs Priority which makes a huge difference. Do need to buy some white poly bags, but totally worth it at $0.10/each