I used Dry Sacks By O.P. when I was hiking. My wife picked them up for me and I was pretty skeptical but, they work great. It's the "fold over" type and I believe there were 3 or 4 different sizes to the pack. Believe it or not, she got them Target. Search Outdoor Products on Amazon.
2013 Jayco Eagle 328 RLTS
2012 Ford F250 6.2L 4x4 CCSB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)