So you may be thinking this is the stupidest question, but is it really worth carrying a pack cover? Someone told me that you're pack will still get wet in the back. This got me to thinking, is it really worth it? Ive used my pack cover before, but wondered if it is worth it on a long exhibition? I was recommended a hiking poncho that would cover me and my pack. Thoughts on that as well please. Minor notes: I have my down sleeping bag in a water-proof stuff sack.