I bought the Mystery Ranch Dragon Slayer a few months back. I have been using it for hiking and scouting and plan to use it as a hunting daypack this fall. The hipbelt stows out of the way when the pack is used as carry on. The interior of the pack has a ton of storage pouches along with some molle webbing for adding pouches.

I have had no problems at all with the trizip. I have also seen all sorts of military personel using different tri zip Mystery Ranch packs so I imagine it should be pretty durable.
My next pack will be the sweetpea