I sling my bow like a gun, over my shoulder. Works fine with a turkey vest, most of the crossbow weight is up high anyways.
Rangefinders, big jump from plain to "weatherproof" when it comes to cost. I mounted mine and if the weather is less than perfect I slide a plastic sheet over it and simply change the way I carry it.
This is the bottom of the barrel Bushnell, works great. It is mounted to a rangefinder mount invented by one of our members here and now produced by Excalibur, works on any scope, gun or bow. I modified mine a bit to add a remote switch.





I even put one on a varmint rifle..




One has to wonder though, does the inventor of this wonderful device actually use one himself?