I've tried several proven compatible bags that usually work great until they just don't work anymore. I've had to empty the canister too many times because the plug slipped or the bag ripped (or exploded). Miele bags last longer, pack tightly, close securely and keep dust out of the air (or into the canister). I have 10 cats, 3 dogs, an allergic husband and a 6 year old boy who loves digging in the dirt so my vacuum needs ALL the help it can get so I will only be using Miele bags from now on .