We have an HSI Agent on our squad who has one of their messenger bags, has had it for awhile and says it pretty tough....VERY durable. The strap is pretty much a seatbelt and buckle. Quick cinch up, reminds me of a Vickers sling.
Ooh-Rah, for sure brother. I've been so swamped since i got into construction I haven't even fathomed making cool sewn gear as much as I'd like. I'm just coming off a big faux bois job and getting into timber again which will mean I'm a bit less under the pump