Spiral Horn,
Sorry to hear about the lost buckle, we would be happy to send you replacement if you would like to reach out to me at the email below. I realize that sending a new buckle does not help you in the field, but here is a very simple fix. By using the existing buckle, you can route the 2" webbing through the buckle and bypass the buckle connection. While you do not have the quick disconnect option, it only takes seconds longer to disconnect via the unthreading through the side 2" tension lock buckle. Similar to how many common belts work. It is every bit as functional once the pack is on, and arguably stronger as you bypass the buckle connection. Photos #1 and #2 below show the routing and should get you back on track until we can get you a replacement. This will also work with many other pack brands. We do also sell a buckle repair/replacement kit for those who asked on this thread. We try to make all of our products as accident-proof as possible.
Additionally, we double back the webbing at the end of the belt so the tab helps catch the webbing end on the buckle. Bending this back a couple times will also help remedy chances of a buckle slipping off the webbing. This is shown in photo 3.
[email protected]
Best
Kurt