The upper part of the filter clogs up and then you start to lose suction before the canister is even close to full. It’s very frustrating. I have to unclog it after every use. Unclogging is messy and I have to scoop it out with my hand. It’s such a hassle. I’m bummed because I would love it if it wasn’t for that. The suction is fantastic (when it’s not clogged) and it’s pretty lightweight. Also, the thin hose attachment is too short & won’t go into thin parts of the car, like between seats. I’m returning it.