I've been asked a few times on how I prepare bananas for shipping, so I put together this video today while shipping a Belle and some unknown banana plant (referred to as "busy bee banana" in 2008) to Tony ("sunfish").
This box weighed right at 7 pounds and cost $11.14 to ship via Priority Mail, including delivery confirmation (postage is discounted slightly and delivery confirmation is free when postage is purchased online at USPS.com or at PayPal). I use a lot of flat rate boxes for other purposes but they're generally not the best choice unless just shipping a large corm without any pseudostem.
Maybe Tony can post a photo or two about the condition of the box upon arrival in about two days.
I hope this helps if you've been looking for some shipping tips. Please feel free to as questions.
Best wishes,
Harvey