Guess I've been lucky, because in all my time on the Camino, I've been bitten once by bedbugs
. T'was in April in Betanzos. Single room in a private, clean albergue. Fresh, clean linen too. Friends in other rooms had no problems, and the host was horrified. Luckily I always keep my pack off the bed, but I can assure you, that I gave it a
thorough inspection, when I got a new room, and my entire pack spent a week in the deepfreezer, when I got back home.
I had no reaction to the bites, and was unable to find at least one of the bites (I squashed two blood-filled bugs).
Anyway, the trash bag idea is a solid and proven method of keeping the bugs out of your pack. Just take care not to drag the pack across the floor when it is in the bag, as the bags aren't that solid
. Wrap a bit of string around the "neck" of the bag, and tie it like you would tie your shoelaces. And don't unpack your pack until you have inspected the underside of your mattress.
I use a slightly different method. Previously, I've some times used a trash bag as a bag liner (against rain), thus having the protection internally in the pack, but I've recently switched to carrying both my clothes and my sleeping gear in dry bags. Not many bugs that can get into those
. The weight penalty is marginal, and I find the few extra grams well worth the result - now I really have to screw up to get damp clothes and/or sleeping bag.
Annie has
a great piece about bedbugs