Pair up - to get the next level in filtration and efficiency with your RIDGID wet/dry shop vac, this kit offers a 1-layer standard RIDGID filter (VF3500) combined with a 2 pack of RIDGID dust bags (VF3501) that fits RIDGID shop vacs 3 to 4.5 Gal. Used together, dust bags and filters can help optimize your vacuum performance for an efficient project cleanup experience. The RIDGID shop vac filter captures everyday dirt and debris such as sawdust, dirt and typical debris found in a basement garage or vehicle. Changing shop vac filters often is strongly recommended to increase the vac's performance and to help extend vacuum life as it protects the motor from harmful dust and debris. The addition of the dust bag allows for a no-mess drum while cleaning. Simply remove the bag from the vacuum and toss for a quick cleanup - no drum lifting needed. These high-efficiency filter bags can help vacuum performance and provide a cleaner operation because it minimizes debris clogs in the filter to increase the filter life. Take your project beyond with RIDGID.