Every self-emptying dock promises weeks without touching dust. Only some of them tell you how big the bag is, what it traps, or what the promise is based on.
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The iRobot Roomba Max 715 Pet states the longest interval here with a sealed bag rated to 0.7 microns. Dreame states the largest bag, 3.2L, on the X50 Ultra. The Roborock Q7 M5+ is the cheapest dock that states a bag size. Read every interval as an estimate — Roborock is the only maker that says so in writing.
Whether you need a self-emptying dock at all is a separate question, and it has its own page: self-emptying dock or manual bin works through when the dock earns its keep and when a hand-emptied bin is the better buy. The short version is that a dock matters most exactly where a small bin fills fastest — carpet, a large floor, and anything that sheds. This page assumes you have landed on yes, and asks which one.
What every dock claim actually is
The headline number on every self-emptying robot is a count of days or weeks. It describes how long the dock's bag should last before you change it, in a household of unstated size, with an unstated number of animals, running an unstated schedule. It is a genuinely useful way to rank docks against each other and close to useless as a prediction for your house.
So the figures below are exactly what each maker publishes, read on its own product page, and nothing more. Where a maker states no capacity or no filtration claim, the cell says so.
Published dock claims, as each maker states them
Model
Stated interval
Bag or bin
What it traps
Brush feeding it
iRobot Roomba Max 715 Pet
90 days
AllergenLock bag, capacity not stated
Particles down to 0.7 microns
Dual rubber anti-tangle, anti-tangle side brush
Dreame X50 Ultra
100 days
3.2L bag
Not stated
HyperStream Detangling DuoBrush
Roborock Q7 M5+
Up to 7 weeks, "based on Roborock internal testing"
2.7L bag
Not stated
JawScrapers anti-tangle, anti-tangle side brush
ECOVACS DEEBOT T30S Combo
Up to 60 days
3L bag — also empties the handheld
HEPA filter stated for the handheld
ZeroTangle spiral roller with comb arrays
Shark PowerDetect 2-in-1
60-day capacity
Bagless bin
"HEPA Anti-Allergen Seal", 99.97% of pet allergens
Self-cleaning brushroll, not described
iRobot Roomba Max 705 Vac
75+ days
Enclosed bag, capacity not stated
Particles down to 0.7 microns
Dual rubber anti-tangle
iRobot Roomba 105 Vac
Up to 75 days
Capacity not stated
Not stated
Multi-Surface bristle
eufy X10 Pro Omni
"2-month dust storage" in image captions
Capacity not stated
Not stated
Auto-detangling roller
Roborock Q7 M5 (plain)
No self-emptying dock
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JawScrapers anti-tangle
Read on each maker's own product page. Dreame's figures retrieved 2026-09-01; iRobot's Max 715 and 105 on 2026-09-13; everything else on 2026-09-17. Sources are listed at the foot of the page.
Three things in that table are worth a second look. Roborock is the only maker that qualifies its own interval in writing — "based on Roborock internal testing; actual results may vary depending on usage conditions" — and, awkwardly, the Amazon listing title for the same Q7 M5+ says seven to nine weeks instead. iRobot is the only maker that attaches a particle rating to the bag rather than to a filter somewhere else. And Shark's base is bagless, which changes what "never touching dust" actually means.
Capacity is the only number that is a measurement
A day count is a forecast. A liter figure is a dimension. That makes capacity the most useful dock number to compare across brands, and the one most makers skip: of the eight self-emptying docks in the table, three state a bag size — Dreame's 3.2L, ECOVACS' 3L and Roborock's 2.7L.
The gap between those three is smaller than the gap between their day counts, which is the point. A 3.2L bag advertised at 100 days and a 2.7L bag advertised at seven weeks hold broadly similar volumes; the difference in the headline is mostly a difference in the household each maker imagined. In a house with a shedding dog, hair is bulky rather than heavy, and every one of those intervals should be read as a best case. Halving them is a more realistic starting point, for the reasons set out in self-emptying vs a manual bin.
Bagged or bagless
Four of the five picks empty into a disposable bag that you lift out and throw away. The fifth, the Shark PowerDetect's NeverTouch Pro base, is bagless: debris goes into a bin that you empty yourself, and Shark states a HEPA anti-allergen seal that traps 99.97% of pet allergens inside while it is closed.
That is a real trade either way. Bagless means no bags to buy and nothing to run out of. It also means that the moment you empty it, you are handling loose dust — the one thing a self-emptying dock is supposed to spare an allergic household. A sealed bag, iRobot's approach on both Max models, keeps the dust enclosed all the way to the bin. If somebody in the house reacts to dander, that difference outranks everything else in the table, and filters, docks and dander goes through why.
The brush decides whether the dock gets anything
A long interval is only worth something if the robot keeps collecting. In a shedding house the failure is rarely the bag filling — it is the main roller winding hair into a collar until it stops lifting anything, at which point the robot drives its whole route and delivers almost nothing to the dock.
That is why brush construction is on this page at all, and why the Roomba 105 Vac is the skip despite a better interval than two of the picks. Its bristle roller is the construction that winds hair worst, and iRobot makes no anti-tangle claim for it. Contrast the Roomba Max 715 Pet and the Roborock Q7 M5+, both of which address the side brush as well as the roller — the part long hair winds around first. The full comparison of what each design does is on rubber vs bristle brushes.
The station that empties more than the robot
The ECOVACS DEEBOT T30S Combo is the odd one out. Its station empties the robot and, ECOVACS states, the handheld vacuum that ships with it as well. For a shedding household that matters more than it sounds, because a robot never touches the hair on the stairs, the sofa or the dog's bed — which, by volume, is most of it.
It is also one of the most expensive machines on this page, and ECOVACS states its HEPA figure for the handheld rather than for the station bag. If the stairs are the problem you are really trying to solve, no robot vacuum climbs stairs is worth reading first — the T30S Combo is the one machine here that answers that page's question in a single box.
How we picked
Criteria first, products second. These are the things we ranked on, stated before anything is recommended.
A stated interval, and whether the maker attaches a condition to it. Every day count is an estimate for a household nobody describes. A maker that says what its figure is based on is telling you more than one that does not.
A stated bag capacity, in liters. It is the one dock figure that is a physical dimension rather than a forecast about your home, so it is the one that compares honestly between brands.
What the bag or bin traps. A sealed bag with a stated particle rating is a filtration claim; a bagless bin means you empty loose dust by hand, whatever the seal around it.
The brush feeding the dock. A roller wound with hair stops collecting long before the bag fills, so an anti-tangle main brush — and ideally side brush — ranks above a longer interval.
Whether you are paying for mop washing you do not need. Several of the best docks here are vacuum-only, and on carpet that is an advantage rather than a gap.
What we did not do: test any of these machines. We do not own one, we do not have a lab, and nothing on this page is written as though we did. The full method.
Quick picks
Ranked on the published specifications below. Tap a row to jump to the full write-up.
#
Product
Best for
Main brush
Price
1
iRobot Roomba Max 715 PetDual rubber anti-tangle brushes and a 90-day allergen-sealed dock — and the one place iRobot has printed an actual suction number instead of a multiple.
The only Roomba with a stated Pa figure
Dual rubber anti-tangle brushes with an anti-tangle side brush
Dreame X50 UltraThe only model here that legs itself over a step rather than driving at it, and the only one that publishes the condition attached to its own headline number.
Roborock Q7 M5+The Q7 M5's LiDAR and anti-tangle hardware, plus the self-emptying dock the plain M5 does not come with — and a stated bag capacity to go with it.
The cheapest self-emptying dock with real mapping
JawScrapers Comb anti-tangle main brush with an anti-tangle side brush
Shark PowerDetect 2-in-1 (AV2800ZE)Shark markets NeverStuck technology specifically at the getting-stuck problem, and then publishes no climb height to back it up.
Every figure in this table is linked to the page it came from in the write-ups below. We have not tested any of these machines.
Top pick
iRobot Roomba Max 715 Pet
The only Roomba with a stated Pa figure
Dual rubber anti-tangle brushes and a 90-day allergen-sealed dock — and the one place iRobot has printed an actual suction number instead of a multiple.
The only model here that legs itself over a step rather than driving at it, and the only one that publishes the condition attached to its own headline number.
60mm over a series of steps, 42mm over a single stepDreame's own condition, quoted: "The gap between steps should be greater than 4cm. For a single obstacle crossing and a single vertical step, the highest obstacle crossing height is 4.2cm." The 6cm headline therefore does not describe a single door sill.Source: Dreame X50 Ultra product page — ProLeap step climbing (retrieved 2026-09-01)
Publishes the caveat as well as the headline, which is rarer than it should be
20,000 Pa stated peak suction and a 395ml on-board bin
Stated 220 minutes of runtime in quiet mode
What it does not
The legs add height and mechanical complexity to a machine that lives under furniture
10.5mm mop raise is modest next to the 17mm figures from Roborock
Who it is for
Split-level rooms, a sunken living room, or a doorway sill that has beaten every robot you have owned.
Skip it if
You read the 6cm headline and stopped there. Dreame's own footnote puts a single vertical step at 42mm, and 6cm only applies to a series of steps with more than 4cm between them.
The dock itself is good: iRobot states up to 75 days, which is longer than several docks costing more. It is the skip here because of what feeds that dock. iRobot fits the 105 with a Multi-Surface bristle brush rather than the dual rubber brushes on its Max range, and makes no anti-tangle claim for it. In a shedding house a bristle roller winds hair into a collar and stops collecting well before the bag is anywhere near full — so the headline interval describes a dock that is not being given much to empty.
Living with a dock
Three things nobody puts on the box. The emptying burst is the loudest thing the machine does — on the only model with published figures, 13 dBA above the robot cleaning — and it typically happens after each run, not once per bag; the quietest robot vacuum has the detail. The dock is bigger than the photographs suggest and needs clearance in front of it, which is the real constraint in a studio; see robot vacuums for a small apartment. And bags are a running cost that none of these makers prices on the product page, which is covered in replacement parts and running costs.
Questions people actually ask
+ What is the best self-emptying robot vacuum?
For a shedding household, the iRobot Roomba Max 715 Pet: the longest stated interval on this page at 90 days, a sealed bag rated to 0.7 microns, and anti-tangle hardware on both the main and side brush. If a stated bag capacity matters more to you, Dreame publishes 3.2L for the X50 Ultra, the largest here.
+ How long does a self-emptying robot vacuum really go between bag changes?
Nobody can tell you for your house. Makers state between seven weeks and 100 days for the models here, each for a household they never describe, and Roborock is the only one that says in writing its figure comes from internal testing. In a home with a shedding animal, start by halving whatever the box says.
+ What is the cheapest robot vacuum that empties itself?
At the time of writing, the cheapest self-emptying model we cover that is sold new is the Roborock Q7 M5+. Make sure it is the plus: the plain Q7 M5 shares the robot but ships with a charging dock only. Live prices for both are on the buy buttons above.
+ Is a bagless self-emptying dock better than one with bags?
It saves buying bags and costs you contact with loose dust every time you empty it. Shark's PowerDetect base is bagless with a stated HEPA anti-allergen seal. iRobot's Max models use a sealed bag instead. For an allergic household the sealed bag is the safer choice; otherwise it is mostly a question of running cost.
+ Do self-emptying docks work with long pet hair?
The dock does; the brush is where it fails. A roller wound with hair stops feeding the dock long before the bag fills. Pick a model with an anti-tangle main brush — and ideally side brush — which is why the bristle-brush Roomba 105 Vac is the skip on this page despite a good dock.
+ Does the robot empty into the dock after every run?
Typically, yes — docks transfer the robot's small on-board bin after a clean, and that is the loud part. The stated interval describes how long the dock's own bag or bin lasts before you change it, not how often the transfer happens.
