Bagged vs bagless self-emptying robot vacuums

How each base works

When the robot docks, a powerful fan in the base opens a flap on the robot's bin and pulls the contents through a duct. In a bagged base, the dirt lands in a paper or fabric bag that seals when you pull it out. In a bagless base, it lands in a clear bin, often with a cyclone or mesh filter to separate dust from air, which you empty into the household rubbish.

Either way, the robot's own bin stays nearly empty, so the robot keeps full suction from room to room. Our page on robot vacuum dock bags covers bag sizes and fit in more detail.

Dust, allergies and mess

This is the main reason people choose bags. A sealed bag goes straight into the bin with very little dust escaping, which suits people sensitive to dust and anyone emptying the base indoors. A bagless bin is opened over a bin bag and some fine dust can puff out, especially with pet hair and dry soil.

Shark's bagless bases include filters, and the Matrix Plus listing mentions True HEPA filtration and an anti-allergen seal in the base. Even so, you still handle the bin. We make no health claims for either type; if dust bothers you, a bag is the tidier option. See our explainer on HEPA filters in robot vacuums.

Capacity, spares and upkeep

Capacity is quoted in days or weeks, which depends on your home, pets and how often the robot runs. The Dreame D20 Plus lists a 5 litre bag lasting up to 150 days and the Eufy C10 a 3 litre bag needing replacing about every 60 days. The bagless Shark Matrix RV2310AE lists up to 45 days and the Ecovacs N20e Plus also lists 45 days.

Bagged bases need bags, while bagless bases need their filters rinsed or replaced from time to time. The Shark RV2310AE filter is washable in cold water only. Neither is maintenance-free, and every base has a duct that can block with long hair; our dock not emptying fixes explain how to clear it.

Spec sheet from the listings

All figures come from the Amazon UK listings. Not stated means the listing does not give it.

See the best self-emptying robots →

Noise and space

Every self-empty base is loud for the few seconds it runs, whether bagged or bagless, because it needs a strong burst of airflow. Most apps let you set Do Not Disturb hours so emptying does not happen late at night. Bagless bases with cyclones can be a little taller, while compact bagged bases such as the Eufy C10's are easy to fit in a hallway.

If floor space is very tight, also look at robots that compact dirt on board, such as the Roomba 205 DustCompactor Combo, which needs no base at all. Our guide to robot vacuums for small flats includes it.

Frequently asked questions

Do I need a self-emptying robot vacuum? Not strictly, but without one you empty a small bin after almost every run. If the robot runs daily or you have pets, a self-empty base saves a lot of fiddly emptying.

Can you reuse robot vacuum dock bags? Most are designed for single use and seal shut. Reusing them is not recommended because the material and seal weaken.

Are compatible bags safe to use? Usually, if they are the right shape for your dock. Poorly fitting bags can leak dust or stop the base sealing, so genuine bags are the safest choice.

Which lasts longer between emptying? On these listings, the bagged Dreame D20 Plus quotes the longest interval at up to 150 days.