Cheapest self-emptying robot vacuum that is worth it
Buy the Dreame D20 Air Plus ($269.99). Dreame says its dock bag holds up to 120 days of dirt, twice as long as the 60 days of the Shark Navigator, and it also mops.
The cheapest self-emptying robot we checked against a maker’s own page is the Shark Navigator ($229.99); the Dreame costs $40.00 more, and the Shark's bag lasts half as long and it has no mop.
Worth it
Dreame D20 Air Plus
Dreame lists a 4 L dock bag, good for up to 120 days. It also has a flat mop pad.
Lowest price
Shark Navigator
Shark says the base holds up to 60 days of dirt. It maps with LiDAR and has no mop.
Another way
Holds up to 75 days of dirt.
Every self-emptying robot we checked, lowest price first
The bag figure is each maker’s own “up to” number. Compare it only against another maker’s number with that in mind.
| Product | Price | Dock bag lasts (maker) | Mops | Navigation | |
|---|---|---|---|---|---|
 Shark Navigator | $229.99 | 60 days (Shark Navigator: maker’s page) | No mop | LiDAR map | $229.99 at Amazon |
 Roborock Q7 M5+ | $249.99 | 49 days, 2.7 L bag (Roborock Q7 M5+: maker’s page) | Mop | LiDAR map | $249.99 at Amazon |
 iRobot Roomba 105 Combo | $269.00 | 75 days (iRobot Roomba 105 Combo: maker’s page) | Mop pad | LiDAR map | $269.00 at Amazon |
 Dreame D20 Air Plus | $269.99 | 120 days, 4 L bag (Dreame D20 Air Plus: maker’s page) | Mop pad | Not listed | $269.99 at Amazon |
 Shark Matrix Plus | $299.99 | 60 days (Shark Matrix Plus: maker’s page) | Sonic mop | LiDAR map | $299.99 at Amazon |
 Roborock Q10 S5+ | $329.99 | 49 days (Roborock Q10 S5+: maker’s page) | Sonic mop | LiDAR map | $329.99 at Amazon |
What makes a self-emptying robot worth it
The point of the dock is that you stop emptying the bin. So the number that matters most is how many days the dock bag lasts before you change it. Every robot on this page has a dock bag rated for at least 49 days. The Dreame D20 Air Plus stretches that to 120.
Makers print “up to”. A house with a shedding pet or a lot of carpet fills a bag sooner. Treat the number as a ceiling and compare the robots by it.
Dreame D20 Air Plus: the one worth the extra money
Why: 120 days is the longest bag life of the six (Dreame D20 Air Plus: maker’s page). Its 4 L bag is about 1.5 times the size of the Roborock Q7 M5+ bag. It costs $269.99.
Shark Navigator: the lowest price
Why: Shark says its base self-empties for up to 60 days (Shark Navigator: maker’s page), and the robot maps with LiDAR. There is no mop in the box. It is $40.00 less than the Dreame.
Roborock Q7 M5+: the Roborock option
Roborock lists a 2.7 L dust bag good for up to 7 weeks (49 days) (Roborock Q7 M5+: maker’s page), 10,000 Pa of suction and a mop. It costs $249.99.
Questions
How much does a self-emptying robot vacuum cost?
Of the six we checked against a maker’s own page, prices run from $229.99 to $329.99 on Amazon.
How often do I empty the dock?
Makers say between 49 and 120 days for these six, as an “up to” figure. The Dreame D20 Air Plus is at the long end.
Do I have to buy bags for the dock?
Yes. A self-emptying dock moves dirt into a bag, and the bag is something you replace. A longer-lasting bag means fewer replacements.
Sources
Each maker’s own pages, quoted above and read again every night. Amazon prices from Amazon’s product data on November 3, 2026. How we work.
- Shark Navigator: maker’s page
- Roborock Q7 M5+: maker’s page
- iRobot Roomba 105 Combo: maker’s page
- Dreame D20 Air Plus: maker’s page
- Shark Matrix Plus: maker’s page
- Roborock Q10 S5+: maker’s page
Next: Best robot vacuum under $500 · Best robot vacuum under $200 that works without Wi-Fi · Which Roomba to buy