Why get waterprommf bags? To keep your stuff dry. WP panniers, no compartments here. We use WP compression bags for our clothing. Any wet clothing goes in the wet compression bag. Tent goes in its own compression bag on the rack. Never had a problem with moisture in the panniers. If it's raining when we camp, panniers come off, get dried with the Packtowl, and go in the tent to be unpacked. They always go in the tent at night, but if it's raining, we unpack them in there. We (Stoker and I) use a 3 person tent. It's well worth it. Two person for a single rider.