Free: Contests & Raffles.
I use my hand to cover the cap and keep water out. I never use a sling unless it is dry, best way I have found so far. No issues yet.
With really wet weather (rain), I'll stay in the cabin or head over to a bar or restaurant. If the wet weather begins while seated in the woods, I get up, pack my gear and head back to the pickup truck.I'll hunt outdoors / uncovered in a light rain with a muzzleloader. But not moderate or heavy rain.