I have a shop vac tucked under what passes for a work bench where I do most of my sanding with the ROS and it's cousins. The other day it was blowing a lot of heat out on my legs and it was already hot in the shop so I thought it might be time to empty the bag. It was about 90% full. Carried out to the trash but was impressed enough to weigh it. 14 1/2 pounds. I just think that's a lot of sawdust. My frugal gene (spelled C H E A P) had kicked in and I had put a date on the bag when I installed it and it had lasted 8 months. I guess I can stand about $8 every 8 months.