The DR 1.5" straps are not sewn. You can shorten with the triglide on the non-cam end. How small of a bottle are you using? I left mine the default length and put a rubber tank bungie over the whole strap and buckle to hold everything tight when used on lp45s.The DR slimline 1.5" straps I've been considering as I have a pair that I use for travel SM cylinders, but would need to dedicate, trim, and have velcro restiched to work on small bottles. Looks like a decent option, although I have like 5 spare unused plastic buckle straps..
I have seen plastic buckles break, they were all majorly sun bleached and abused.