Litter Boxes for Under a Bathroom Sink

Q: How do I measure for a sink cabinet?

Measure the width, depth and height where the box will sit. Subtract space for the plumbing, the hinge side of the door and any shelf. Leave room to lift the box out.

Q: Is a small box right for a large cat?

Often not. Cornell says larger cats need bigger boxes. Check the cat's size and choose a box to match.

Q: Do these boxes have lids?

The Uiifan listing describes an open design. The Volope listing does not say whether it has a lid, and its question on the page has no answer in the text we read.

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The person typing “litter box under bathroom sink” wants a box that fits a cabinet space and still suits the cat. Neither listing we read says it fits under a sink. Both state dimensions, so you can measure your own cabinet against them. This guide compares two small boxes by their listed figures, names what the listings leave out, and sets out how to measure before you buy.

Quick answer

Measure the cabinet first, then compare the listed sizes. Neither listing states under-sink fit.
The Uiifan listing states 16.93 x 12.01 x 3.15 inches, a 3.15-inch low entry, and plastic material.
The Volope listing gives 15.7 x 11.8 x 2.8 inches in its title, but its size options also include 4-inch heights and larger 17.7 x 13.8 sizes. Check which size you are buying.
Cornell says “Young kittens, elderly cats, and cats with mobility problems need boxes with low sides,” and “Larger cats need bigger boxes.” A small box is not the right choice for every cat.

Side by side: the figures each listing states

The table uses only the columns the listings give. “not stated” marks a field the listing does not give.

Listing	Dimensions as stated	Height or entry as stated	Material as stated	Weight as stated	Lid as stated
Uiifan Low Entry Cat Litter Box (B0GVK4TR2D)	16.93 x 12.01 x 3.15 inches	3.15-inch low entry	plastic	1.08 pounds	not stated
Volope Small Stainless Steel Kitten Litter Box (B0F83LMTM3)	15.7 x 11.8 x 2.8 inches (title); options also list 4 inches high	2.8 inches (title); 4-inch option listed	stainless steel	1.08 pounds	not stated

The listing says: Uiifan Low Entry Cat Litter Box, Black Gray, 16.9 x 12 x 3.15 Inch

From the Amazon listing (ASIN B0GVK4TR2D), read on 2026-10-19:

Product dimensions: 16.93 x 12.01 x 3.15 inches; 1.08 pounds. Size: “16.93 x 12.01 x 3.15 inches / 43 x 30.5 x 8 cm.”
Entry: “3.15-inch low entry.”
Material: plastic. Model: GGN-Uiifan-4821. Date first available: March 31, 2026.
Bullets: “Open design promotes ventilation and easy viewing”; “Durable plastic with smooth non-stick surface.”
Note on the page: “Manual measurement, please allow slight errors on size. Before purchase, confirm whether the product size is suitable for your pet.”

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The listing says: Volope Small Stainless Steel Kitten Litter Box, Low Entry, 15.7 x 11.8 x 2.8 in

From the Amazon listing (ASIN B0F83LMTM3), read on 2026-10-19:

Product dimensions: 15.7 x 11.8 x 2.8 inches; 1.08 pounds.
Size options: 15.7L*11.8W*2.8H, 15.7L*11.8W*4H, 17.7L*13.8W*2.8H and 17.7L*13.8W*4H.
Material: stainless steel. Manufacturer: Volope. Date first available: May 9, 2025.
Bullets: “Low-profile design fits snugly in small spaces”; “Stainless steel won’t trap odors like plastic does”; “Designed especially for Kittens & senior cats.”

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What the listings say about fit

Neither listing mentions a sink, a cabinet or a bathroom. The fit question is therefore one you answer with a tape measure. The Uiifan listing notes that its size is a manual measurement with possible slight errors, so measure the cabinet and the box yourself. The Volope title gives 2.8 inches as the height, but its size options also show 4-inch versions and larger 17.7 x 13.8 sizes. The listing does not say which option matches the title. Buy the option you measured, not the title size.

How to measure the space

Measure the cabinet width, depth and height where the box will sit. Measure at the back and the front, because pipes and the trap can narrow the space.
Subtract space for the plumbing, the hinge side of the door and any shelf. Your figure is the usable space.
Leave room to lift the box out and to scoop. The listings do not say whether their figures are outside or inside dimensions, so allow for both.
Compare the usable space with the listed outside size. Use the listing’s figures only as a starting point.

Low sides, cats and the cabinet

Cornell says that “Young kittens, elderly cats, and cats with mobility problems need boxes with low sides.” The Uiifan listing describes its low entry as a way for “older, weak, or disabled cats” to enter without climbing. The Volope listing describes a low-profile entry for kittens. Low entry matters for an older cat, but a low box is not a substitute for the right size. Cornell also says that “Larger cats need bigger boxes,” so a small under-sink box may suit a kitten or a small cat and not an adult cat.

Under a sink, the cabinet door is usually closed. Cornell says “from your cat’s point of view, covers hold odors in.” This assumes the cabinet door stays closed. The listings do not address cabinets, so plan for air flow if the box sits behind a door. Cornell also says “Most cats prefer an uncovered box that lets odors escape and allows a 360-degree view of their surroundings.”

How we chose

The keyword “litter box under bathroom sink” does not name a product, so we searched for slim and small boxes on Amazon on 2026-10-19. We opened two listings whose titles or product details give exact sizes: the Uiifan box (B0GVK4TR2D) and the Volope box (B0F83LMTM3). This is not a ranking. We did not open the other small boxes in the results, and we did not use prices, ratings, review counts, badges or customer review text.

What we could not verify

Whether either box fits under a bathroom sink. Neither listing says.
Interior dimensions and litter depth. The listings give outside figures only, as far as we read.
Whether the Volope box has a lid. A question on its listing asks, and the text we read gives no answer.
The weight limit or load rating of either box.
How long either box lasts. The listings do not say.

Checklist before you buy

Measure the cabinet and subtract plumbing and hinge space, as above.
Match the size to the cat. Cornell says “Larger cats need bigger boxes.”
For an older cat or a cat with mobility problems, look for low sides. Cornell says these cats need boxes with low sides.
Count your boxes. Cornell says to “Keep as many litter boxes as cats in the house – plus one.”
Check the size note on the listing and allow for slight differences if the listing says manual measurement.

Mistakes to avoid

Using the title size only. The Volope title gives 2.8 inches, but its size options include 4-inch versions and larger sizes.
Assuming the box fits a sink because it is small. Neither listing says it fits under a sink.
Buying the smallest box for an adult cat. Cornell says larger cats need bigger boxes.
Closing a cabinet door on a box with no air flow. Cornell says covers hold odors in, and this assumes the door stays closed.
Assuming a lid. Neither listing states one clearly. The Volope listing does not say whether it has a lid, and Uiifan’s page calls its design open.

FAQ

Does either listing say it fits under a bathroom sink?

No. Neither listing mentions a sink or a cabinet. Measure the space yourself before you buy.

How do I measure for a sink cabinet?

Measure the width, depth and height where the box will sit, then allow for pipes, the door hinge side and any shelf. Leave room to lift the box out.

Which box has low sides?

Both listings describe a low entry. The Uiifan listing gives a 3.15-inch low entry. The Volope listing describes a low-profile entry. Cornell says low sides suit young kittens, elderly cats, and cats with mobility problems.

Is a small box right for a large cat?

Often not. Cornell says “Larger cats need bigger boxes.” Check the cat’s size and choose a box to match.

Do these boxes have lids?

Uiifan’s page calls its design open. The Volope listing does not say whether it has a lid, and its question on the page has no answer in the text we read.

Bottom line

Measure the cabinet and your cat first. A listed size is only a starting point, and neither listing states under-sink fit. Choose the size by your cat’s size and the usable space, and plan for air flow if the box sits behind a closed door.

For related reading, see our guides to litter boxes for small apartments and self-cleaning cat litter boxes.

Sources

Cornell Feline Health Center, Feline behavior problems: house soiling: https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feline-behavior-problems-house-soiling (opened 2026-10-19). Cited for the low-side, larger-box, cover and box-count statements.
Amazon listing, Uiifan Low Entry Cat Litter Box, Black Gray, 16.9 x 12 x 3.15 Inch (ASIN B0GVK4TR2D): https://www.amazon.com/dp/B0GVK4TR2D (opened 2026-10-19). Cited for the dimensions, low entry, material and size note.
Amazon listing, Small Stainless Steel Kitten Litter Box, Low Entry, 15.7 x 11.8 x 2.8 in (ASIN B0F83LMTM3): https://www.amazon.com/dp/B0F83LMTM3 (opened 2026-10-19). Cited for the dimensions, size options, material and low-profile statement.

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