Hello, sc/out/s. I just bought a nice little sleeping bag for my bug out bag, and while it’s water resistant, it’s not waterproof. At the very least I want to waterproof the underside so my ass isn’t wet when I wake up when I go test the bug out bag in the field. I’d like to use a waterproofing spray since a bivy would make the bag bulkier, and a sleep pad would take up more space. I was wondering if anyone here had any experience with one.