For the Ninja Slushi

Cups and Tumblers for the Ninja Slushi

Start with the finding, because it shapes everything below: not one cup, glass or tumbler on Amazon claims to fit a Ninja Slushi. Three dedicated searches returned cup organizers, cookbooks, carrying bags and whole machines, and no drinking vessel making a fitment claim of any kind. So this page cannot be a fitment page in the way the rest of this site is, and it is not going to pretend otherwise.

It also is not going to be organised around the question you might expect. We looked hard at whether "what cup height fits under the spout" is the thing owners want to know, and it is not: in the entire history of the owner community exactly one person has asked it and nobody replied. The height question owners genuinely ask is whether the machine fits under their kitchen cabinets, which is a different guide.

What owners do argue about is insulation, sharply and in both directions, and what the manual actually gives you is capacity. The vessel takes between 16 oz and 64 oz, Ninja advertises 7+ drinks from a batch, and those two numbers together decide how big a cup makes sense in your kitchen. That is the honest organising principle for this category, and it is what follows: the arithmetic, the insulation argument with both sides sourced, Ninja's own cup as the one official reference point, and the shape owners keep asking for that nobody makes.

Updated Jul 26, 2026 · Researched from manufacturer specifications and owner reports; every claim on this page links to its source.
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Best overall01 / 06

Ninehaoou

Ninehaoou 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Sets

The size that divides into a full vessel exactly four times, in the quantity you want if the machine came out for a party. Dome lids and spoon straws, which is the right shape for a drink you end up digging at.

Check price on Amazon

Fitment check

Sourced

Ninja Slushi · the drip tray, under the dispense handle

Note. Cups claiming to fit the Ninja Slushi — none exist; three dedicated searches returned organizers, books and machines
Fits. How much one full batch pours — the guide fills the vessel between 16 oz and 64 oz and Ninja claims 7+ drinks
Note. Ninja's own cup for this machine — 10 oz and 4.8 in tall, and its compatibility list names the FS301
Conditional fit. The 7.5 in margarita glass figure — a description on the drip tray listing, repeated for the FS300 tray, not a clearance
Does not fit. Any published spout clearance — the owner guide states no height, no clearance and no maximum cup size
Conditional fit. Heavily insulated tumblers — one owner argues they keep the ice too cold to drink, another that they help
Conditional fit. The 24 oz clear insulated tumbler owners ask for — an owner request for 20 to 24 oz double-insulated clear tumblers nobody sells
Conditional fit. Using a party cup to catch the rinse cycle — the guide warns rinse water dispenses fast and wants a large cup or bowl

Checked Jul 26, 2026 · source 1 source 2 source 3 source 4 source 5 source 6

All 6 cups and tumblers, compared

Ranked by fit confidence

Cups and tumblers compared by fitment
Cups and tumblers	Fitment
Ninehaoou 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Sets Best overall	Fits.Bolt-on	Check on Amazon
Ninehaoou Clear 24 oz Slushie Cups with Dome Lids and Spoon Straws, 6 Set Closest to what owners ask for	Fits.Bolt-on	Check on Amazon
Ninja SLUSHi Insulated Cocktail Cup with Lid and Straw, 10 oz Does not fit	Fits.Bolt-on	Not sold online
ZEAYEA 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Pack Same size, stated dishwasher safe	Fits.Bolt-on	Check on Amazon
Ninehaoou Dark 24 oz Slushie Cups with Dome Lids and Spoon Straws, 6 Set For outdoors	Fits.Bolt-on	Check on Amazon
ZOKU Slush and Shake Maker Cup with Freezer Core Does not fit	Does not fit.Does not fit	Skip it

Ninehaoou 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Sets

Best overall

—

Bolt-on

Check on Amazon

Ninehaoou Clear 24 oz Slushie Cups with Dome Lids and Spoon Straws, 6 Set

Closest to what owners ask for

—

Bolt-on

Check on Amazon

Ninja SLUSHi Insulated Cocktail Cup with Lid and Straw, 10 oz

Ninja's own, and the only official one

—

Bolt-on

Not sold online

ZEAYEA 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Pack

Same size, stated dishwasher safe

—

Bolt-on

Check on Amazon

Ninehaoou Dark 24 oz Slushie Cups with Dome Lids and Spoon Straws, 6 Set

For outdoors

—

Bolt-on

Check on Amazon

ZOKU Slush and Shake Maker Cup with Freezer Core

Does not fit — This is a competing applia…

The reviews

Ninehaoou

Best overall01

Ninehaoou 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Sets

Fits Ninja Slushi

Install note

Generic, like everything in this category, because no cup on Amazon claims Slushi fitment at all. The case for this size is arithmetic against sourced numbers rather than a fitment claim: the manual takes a minimum of 16 oz and a maximum of 64 oz in the vessel and asks you to fill to the max line for the best dispensing behaviour, so a full batch is exactly four of these. It also sits close to what Ninja means when it advertises 7+ drinks per batch, which implies a serving well under half this cup. Nothing here is a claim about the machine, only about how many times you can fill something from it.

official · official

Check on Amazon

Ninehaoou

Closest to what owners ask for02

Ninehaoou Clear 24 oz Slushie Cups with Dome Lids and Spoon Straws, 6 Set

Clear, domed and large, which is most of the specification owners keep posting for. It is single-wall plastic rather than insulated, because the insulated version of this cup does not seem to exist.

Fits Ninja Slushi

Install note

A generic pick, and it has to be: not one cup, glass or tumbler on Amazon claims to fit a Ninja Slushi, so no seller in this category has issued a fitment claim we could check. What decides the choice is capacity against the vessel. The owner guide fills between 16 oz and 64 oz and asks you to fill to the max line for the best dispensing, and Ninja advertises 7+ drinks per batch, which works out nearer 9 oz than 24. A full vessel is four servings at 16 oz. Take the drink in a cup this size and a full batch is closer to two and a half. Note also that the title and the bullets disagree about the capacity of this very cup, which is why we do not repeat seller capacities as specifications.

official · official · reddit

Check on Amazon

Ninja

Ninja's own, and the only official one03

Ninja SLUSHi Insulated Cocktail Cup with Lid and Straw, 10 oz

The only drinking vessel anywhere whose compatibility list names the FS301. Not sold on Amazon, and here because its published height and capacity are the one official reference point this category has.

Fits Ninja Slushi

Install note

Ninja names the FS301 on this cup's compatibility list, which no other cup in existence does. Two things it tells you and one it does not. It tells you Ninja is happy selling an insulated cup for this machine, which is worth knowing given that owners argue about insulation. It tells you the size Ninja pictures you drinking from, 10 oz and 4.8 in tall, which is a good deal smaller than the party cups most people buy. What it does not tell you is any clearance: a compatibility list is not a measurement, and the owner guide states no height, no clearance and no maximum cup size anywhere. Ninja sells no glass at all, only this cup, so on the whole subject of what you drink out of, this is the entire official record.

official · official · official

Capacity10 oz

Height4.8 in

Ninja lists it forFS305CO, FS305CCO, FS301, FS300, FS301C, FS300C

InsulatedYes, with a lid and straw

Not sold online

ZEAYEA

Same size, stated dishwasher safe04

ZEAYEA 16 oz Slushie Cups with Dome Lids and Spoon Straws, 12 Pack

The practical detail once you own twelve of them, plus a stated BPA-free construction.

Fits Ninja Slushi

Install note

Generic again, and worth saying once more that this is not a hedge: three dedicated searches for Slushi cups returned cup organizers, cookbooks, carrying bags and whole machines, and not one cup claiming to fit this appliance. On the numbers this divides into the vessel cleanly, four of them to a full 64 oz fill. One thing the manual does bear on directly: it warns that liquid from the rinse cycle dispenses quickly and tells you to have a large cup or bowl ready to catch it, and a 16 oz party cup is not that. Keep something much bigger for cleaning day.

official · official

Check on Amazon

Ninehaoou

For outdoors05

Ninehaoou Dark 24 oz Slushie Cups with Dome Lids and Spoon Straws, 6 Set

The same large cup in colours, and the version whose bullets agree with its own title about the size.

Fits Ninja Slushi

Install note

Generic, no Slushi claim on the listing, same as every cup here. The capacity reasoning is the same as for the clear version and so is the caution about believing it: these two listings come from one seller and disagree with each other about the size of the same cup, which is a useful reminder that a number in a listing title is marketing copy rather than a measurement. Work from the vessel instead. The manual fills it between 16 oz and 64 oz and Ninja claims 7+ drinks per batch, so the honest way to size a cup is to decide how many drinks you want out of one batch and divide.

official · official

Check on Amazon

ZOKU

Not a cup for your machine06

ZOKU Slush and Shake Maker Cup with Freezer Core

A rival appliance in cup form, kept here because it fills the search results and its own small print teaches the sugar rule.

Not for Ninja Slushi

Install note

This is a competing appliance rather than an accessory: you freeze its core, pour a drink in and scrape a slush out of it by hand. Nothing about it relates to the Slushi except the word in the name. Worth reading one of its bullets though, because it rhymes with the rule that governs everything you put in the Ninja: it says flatly that it will not freeze a sugar-free or diet beverage. The Ninja owner guide sets the same physics as a requirement, a minimum of 4% sugar in any input, and a rival product volunteering the same constraint is a decent sign the constraint is real rather than a Ninja invention.

official · official

Skip it

What to check before you buy

Nothing here is a fitment question, so these are the four things that actually change the drink.

Size the cup to the vessel, not to your thirst. The guide fills between 16 oz and 64 oz and says filling to the max line gives the best dispensing. A full batch is four cups at 16 oz. Go bigger and you are into halves.
Decide whether you want insulation, knowing owners disagree. One well-received owner argues against premium insulated tumblers on the grounds that they keep the ice too cold, so you sip the flavour off the top and are left with ice you cannot drink. Another recommends insulated tumblers precisely because the drink melts more slowly. Both are describing the same physics and wanting opposite things from it.
Clear or not. Half the appeal of this machine is the colour, and the double-walled insulated tumblers that keep a drink cold are mostly not clear. That is the trade owners keep running into.
Do not trust a stated capacity. One listing on this page says one size in its title and a different one in its own bullets. Cup sizes are marketing copy, which is exactly why the arithmetic here is done against Ninja's fill limits instead.

What Ninja does and does not say about what you drink from

Ninja publishes two height-shaped facts about this machine and they bracket the question rather than answering it. Both are worth knowing precisely, because both get misquoted.

Its own cup is 10 oz and 4.8 in tall. The Ninja SLUSHi Insulated Cocktail Cup names the FS301 in its compatibility list, which makes it the only drinking vessel in existence with a published fitment claim for this machine. Note what that tells you: Ninja is happy selling an insulated cup for the Slushi, which is a data point in an argument owners are still having. Note also how small it is against the party cups most people buy.

Its drip tray listing says the tray fits an average 7.5 in margarita glass. That is the only figure of its kind Ninja publishes anywhere, and three cautions travel with it. It describes a glass Ninja considers to fit rather than a clearance anyone measured. It appears on a parts listing and never in the owner guide. And Ninja prints the identical sentence on the FS300 tray, a different part for a different machine, which makes it copy across a product line rather than a measurement taken on your Slushi.

Between and above those, nothing. The owner guide states no height, no clearance and no maximum cup size, and its entire positional instruction is to place a cup on the drip tray under the handle. No owner in a corpus of more than a thousand threads has published a measurement either. If you want a tall glass, the honest answer is to try it, because nobody has published a number and we are not going to invent one.

What we could not verify

The cup owners actually want does not appear to exist. The request, in an owner's own words, is for a set of 20 to 24 oz double-insulated clear tumblers with dome lids and straws, and they report a surprisingly hard time finding anything. A dedicated search for exactly that turned up nothing either. The insulated tumblers are not clear, the clear ones are single-wall plastic, and nobody is making the overlap. That is a real unmet demand and we would rather record it than pad this page with near-misses.

We also cannot tell you whether insulation helps or hurts, because the two owners who have argued it in public are both right about the mechanism and want different outcomes from it. One wants the drink to last, one wants it to stay drinkable to the bottom. Nobody has compared them side by side and we do not test physically.

And the clearance, once more, because it is the question this page keeps being asked. It is unpublished by Ninja, unmeasured by any owner we can find, and the one official figure is boilerplate shared with another machine. One person with a ruler could close it.

Questions owners ask

What cups fit the Ninja Slushi?

Any cup you like, and that is not a dodge. No cup, glass or tumbler on Amazon claims to fit this machine, Ninja publishes no clearance and no maximum cup size, and the owner guide only tells you to put a cup on the drip tray under the handle. The real decision is capacity against the vessel and whether you want insulation, which is how this guide is organised.

How many drinks does one Ninja Slushi batch make?

Ninja advertises 7+ drinks per batch, and the vessel takes between 16 oz and 64 oz with the guide asking you to fill to the max line for the best dispensing. So a full batch is four cups at 16 oz, or seven-ish of the smaller servings Ninja has in mind. Take the drink in something much larger and a full vessel does not go as far as people expect.

Should I use an insulated tumbler with the Ninja Slushi?

Owners disagree, and both sides are worth reading. One argues against premium insulated cups because they keep the ice too cold: you sip flavour off the top for a few gulps and are left with ice you cannot drink. Another recommends insulated tumblers specifically because they stop the drink melting too quickly. Ninja itself sells an insulated cup for this machine, for what that is worth. Nobody has compared them properly.

How tall a cup will fit under the spout?

Nobody has published the number. The owner guide states no height, no clearance and no maximum cup size. The only height-shaped figure Ninja publishes is on its drip tray listing, which says the tray fits an average 7.5 in margarita glass, and that sentence is repeated word for word on the tray for a different machine, so it is product copy rather than a measurement. No owner in a corpus of more than a thousand threads has reported a measurement either.

What should I use to catch the rinse water?

Something much bigger than a drinking cup. The guide has you press RINSE, add hot water up to the 64 oz fill line and dispense it immediately, and it warns that the liquid comes out quickly and to have a large cup or bowl ready. Ninja sells nothing for this, which is a genuine gap. A wide low bowl is the shape that works, because it is the only one that fits where the drink comes out.

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