People should consider using a Tyvek envelope as to enclose the vac sealed/mbb inner packages. Then place the whole bundle inside your mailer or box. Tyvek is very hard to puncture or rip. Very tuff stuff. If you want to go on the cheap the Chinese equivelent to Dupont Tyvek is also available. Discuss...
The baggy Priority envelopes from USPS are Tyvek and free.