Mark F wrote: > QJS, that seems like it may be an option, but I have reservations about anything strapped to the outside of the pack

Obviously some common sense has to be used. I'm not advocating keeping the only item that will keep you alive on cold nights, in a paper bag, with a bank counter rubber band attaching it to your sac.
Use a strong waterproof stuff sac, with straps you can run the bunjees inside of, so they aren't relying on only friction. Though in reality bunjees grip like an alligator. Anything strong enough to pull the bag off my sac would pull me over first. Straps don't hold as tightly.
Tip for staying on the mat; have it inside the bag.

qjs