I just posted this elsewhere but I still think this is what I would do for a survival sling. Takes about 5 minutes (factoring in the adjusting), takes a minimal amount of materials and the pouch can be adjusted on the fly very easily if the size of your ammo changes, it by-passes the weaving other designs require and no cutting required so the material can be repurpsed for something else. It's not a perfect sling design by any means but I think it's the perfect survival sling design. I guess your design walter is basically the same but with more loops which I haven't tried but yeah these designs with no need to weave and all from one length are the way to go.