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I'd be interested in seeing how well those would do in the event of a flip and chundering. We typically use camstraps that are rated to about 1000 lbs, some maybe more
. And sometimes these break too due to the stresses of being hammered in the water. The rafter's motto is "rig to flip, dress to swim" and I don't quite see those loopables as really measuring up if something real happens on the river. There are bound to be lots of good uses for them around camp, but I'm not sure I'd trust them on the river for anything important.
You can get camstraps from most of MB's sponsors that sell accessories (see list here
), there are plenty of options and they all sell whitewater quality gear. In addition to all the great folks that sponsor the Buzz, locally for you there's a raft shop called DownRiver Equipment
down in Wheat Ridge just off I-70 where you could spend some time and they could tell & show you lots of things to help you get started. You really should go in there, or any whitewater shop, and check things out.
Have fun learning about all this stuff!