Woods scrambling with a long gun lately has raised some questions: how to keep a long gun secure, barrel free of debris, and ready to use in a reasonable time?

I am currently using a sling that does well when I am moving pretty much upright, but has been challenged when I crawl, or move through thick brush. I worry about the erratic and sometimes extreme movements of rock hopping, wading a slippery stream, or taking a fall. Is there something better than a ballon over the barrel to keep debris out?

Is there a best-in-class, better-mousetrap type of technology?

Would attaching the gun to a pack be a better idea?

Thoughts?

Thanks.