How many times do you plan on changing in one day??? The trick is just take one thing out when you need it, no need to dump everything out at once.I'll take my chances now. A one night trip to a laundry mat drying out my undies is better then a hunndred times of putting things in and out of plastic bags. Now if I was rafting or kayaking.. different story.
I did once make a trip to a laundry mat to dry my sleeping bag after I did a canoe float and came back to find the rain-fly on my tent was not tied down quite right.