The clamp needs a rail. Your bed doesn’t have one.

—Read this before anything else

This is not the nightstand problem. It is the mounting problem.

A nightstand with no square inch left on it is a tidiness problem, and tidiness has an answer. This is a different thing. On the bed itself there is nothing rigid to hold on to, so nearly everything built for the job goes hunting somewhere else in the room — a rail, a tube, an arm, a gap between slats. Here is the menu, in the manufacturers’ own words.

Then the panel that gives the whole game away. Tell BedShelfie you have a platform bed or a box spring and it does not sell you a clamp at all — it routes you to a separate under-mattress Slide model. The homepage says it plainly: installation uses “a clamp or slide-in design, depending on your bed frame.”

Depending on your bed frame. Not on your bed. The neighbouring categories answer the same way: CouchCoaster, the weighted silicone saddle for sofa arms, states its requirement outright — “14cm / 5.5″ minimum arm width required to ensure a secure fit.” It needs an arm. A mattress inside an upholstered frame offers a padded wall and a mattress, and that is the entire inventory.

Sources: bedshelfie.com (manufacturer’s own store) · medmartonline.com (Medline product listing) · hitproducts.com (CouchCoaster). Prices and requirements fetched 4 September 2026.

—The tell that the fear is real

Three mattress warranties. One of them names beverage spills.

Sources: tempurpedic.com · purple.com · casper.com — published warranty, care and product pages, quoted verbatim. Fetched 4 September 2026.

—Why a wide foot is the only move left

Your mattress was measured with a dinner plate.

Foam firmness is reported as IFD — Indentation Force Deflection — under ASTM D3574. The Polyurethane Foam Association, the flexible-foam industry’s own trade body, defines it as the force in pounds needed to compress “a 50 square inch circular indentor foot into a four inch thick sample,” read at 25 and 65 percent of the sample’s height.

Fifty square inches. A circle of that area is 7.98 inches across — a dinner plate. Everything you believe about how firm your mattress is comes from pressing a dinner plate into it. Spread a load over that much area and the foam pushes back the way the spec sheet promises. Concentrate it into something narrower and the pressure per square inch climbs, and it goes in deeper. Not a defect: the material doing exactly what you paid for.

A tumbler is the opposite of that plate. Stanley lists the 40 oz Quencher H2.0 at 3.54 × 5.43 × 11.02 inches and 1.18 lb empty — nearly a foot tall, mass up high once it is full, standing on a fraction of a dinner plate’s area, on a surface engineered to yield under it.

The base here is fixed at 5.2 inches: roughly 21 square inches of footprint under a container whose own bottom is a fraction of that. The weight presses into the foam over a substantially larger area, and the base of support is far wider than the cup’s, so the drink’s centre of mass has to travel considerably further sideways before it clears the edge of what is holding it up. It resists tipping by widening the footprint. That is the whole claim, and on a bed it is the only one available.

On a hard, smooth surface — a deck board, a cooler lid — the tack of the TPU does a second job and resists sliding. Against bedding that is not something to count on, and this page does not count on it.

Sources: pfa.org glossary (Polyurethane Foam Association), reference method ASTM D3574 · stanley1913.com. Fetched 4 September 2026. The 7.98-inch figure is arithmetic from the 50-square-inch area, not a quoted specification.

—The object

One piece of moulded TPU. Six fins.

• 5.2″ base — fixed. It does not expand, contract or deform, and there is one size.
• 2.8″ tall, and 1.64″ across the opening at rest.
• Six fins that flex from 0.92″ to 3.15″, which is the whole fit range.
• About 3.6 oz. Shore 85A thermoplastic polyurethane, one piece, no hardware, nothing to loosen.
• Nothing hollow. There is no cavity to hold water, and it is dishwasher safe, top rack — which is the only hygiene question that really matters about an object that lives in a bed.
• It stows flat. Into the nightstand drawer, or under the bed, on the mornings you would rather not look at it.

—What seats and what does not

Measure the bottom of the cup you actually drink from in bed.

A standard 12 oz can is 2.6 inches across the barrel — Ball Corporation’s product standard gives a body outside diameter of 2.600 inches — and sits well inside the range. So does the water glass out of the cupboard. A Stanley 40 oz Quencher, which is the cup this question is usually about, is published at 3.1 inches across the base: snug, and it seats. The 30 oz is published at 3.15, which is the very top of the fin range and worth a sticky note before you order rather than after.

A handled mug does not seat at all: the handle lands exactly where the fins grip. Stemmed glasses do not seat either. Both are a straight no — and if your bedtime drink is tea in a mug, the honest answer on this page is a nightstand, a clip-on shelf, or the rail holder that is slotted for a handle.

Or the width across the bottom

Width in inches Check it

A width across the bottom of the glass, in inches.

Sources: Ball Corporation product standard (12 oz can body outside diameter 2.600 ± .008 in) · stanley1913.com. Every width in the search box is a published manufacturer or retailer figure carried with its own citation, not an estimate of ours. Fetched 4 September 2026.

—Where it goes

The side of the bed that was never going to get a nightstand.

Put it on the flattest thing within reach — the mattress just past your hip, or a folded blanket laid down for it. Not on a fold and not on a heaped duvet: on a fold it sits at the angle of the fold, because it does not make bedding flat and does not pretend to.

Two facts make that spot exist, and neither of them is your fault.

One long side of a lot of beds is against a wall. The International Residential Code sets the floor for a habitable room — not less than 70 square feet, and “not less than 7 feet in any horizontal dimension.” Seven feet is 84 inches. The Better Sleep Council, the mattress industry’s own consumer education arm, puts a queen at 60 by 80 inches. Eighty-four minus sixty leaves twenty-four inches for both sides of the bed combined, and IKEA’s HEMNES nightstand is 13¾ inches deep, so two of them want 27½ inches before anybody walks anywhere. That is the code minimum rather than the average bedroom — but it is the arithmetic that decides studios and small rooms, where the door and the closet settle the layout before you do. Whoever sleeps on the wall side is not getting a nightstand at any price. The wall got there first.

And the nightstand you do have is not at drink height. IKEA sells a KNARREVIK at 20½ inches tall for $14.99 and a HEMNES at 27½ inches for $129.99 — seven inches apart, one store, both called the same thing. Casper lists its mattresses at 11, 12 and 14 inches on a foundation 7.5 inches high, and its own guidance says the standard bed height “sits at approximately 25 inches.” Fourteen inches of mattress on that foundation puts the sleeping surface at 21½ before a frame is involved. Neither nightstand is wrong. The two industries simply never agreed on a number, which is why reaching for a glass in the dark means reaching down and out at once, over the edge of something that gives as you lean on it.

Twelve colours, and the ones this page was built around are the quiet end of them — Quiet Morning, Fresh Linen, Oatmeal, Lamplight, Midnight. A second one on the other side of the bed is the usual order.

Sources: up.codes (IRC R304.1 and R304.2) · bettersleep.org · ikea.com · casper.com. Fetched 4 September 2026.

—What the aisle costs

Everything else needs something a bed does not have.

Prices and requirements were looked up on 4 September 2026, not estimated. Every figure in the last column is the seller’s own published requirement, in the seller’s own words where it is quoted.

Four honest concessions, because this aisle has genuinely good products in it and you have probably been burned by the bad ones.

If you have a nightstand within reach at roughly mattress height, on your side, you are done — stop reading. This page is about the sides of beds that do not have one. The overbed table genuinely works: it is the only thing here that puts a rigid, level surface at your elbow while you lie down. It wants 26 by 15 inches of clearance to roll under the bed, which platform, storage and low-profile frames do not give it, and it looks like what it is. The clip-on shelf genuinely works if your bed has a rail — a dorm bed, a bunk, a metal frame, an IKEA bed with a side rail 1.8 inches or taller. It gets the drink off the soft surface altogether, which beats everything else on this list including us. And the waterproof protector is worth owning whatever else you decide.

What is left over is a specific bed: a platform or upholstered frame with no rail to clamp, no clearance to roll a table under, and one long side against a wall — where the only surface within reach of your hand is the one you are lying on.

Sources: bedshelfie.com · carex.com · cupcozypillow.com · medmartonline.com · totallybamboo.com · hitproducts.com · ikea.com · casper.com. Prices and specifications fetched 4 September 2026 and current as of that date. Steadi Labs is not affiliated with any of them.

—From people who bought one

Four of these say the word bed. We did not have to stretch one of them.

Verbatim, unedited, not filtered by rating. This is a slice of one product-wide corpus — reviews of the Steadi, not of this page — and most of it is about couches. These four are about beds. The third one asks for the one thing we do not make.

★★★★★

I am so happy. I leave it on my cup 24/7!

Customer · 2026-08-18Photo from the buyerPhoto from the buyerPhoto from the buyerPhoto from the buyerPhoto from the buyerPhoto from the buyerPhoto from the buyer

★★★★★

As advertised and works great. If you don’t have a side table at the right spot for your couch or bed, this will solve your problem.

David White · May 2026

★★★★★

Very pleased with this. Feels premium and sturdy, and nice to look at when in use. As someone who once spilled a can of cola on the bed, I now confidently place my soda can on the bed without worry!

Michael Mendoza · May 2026

★★★★★

Literally love these. Living with chronic illness sucks and often means dinner in bed, and limiting my beverage to my side table when I have the whole mattress to picnic? I was wishing something like this existed and the algorithm delivered. Simple, lightweight, flexible! Immediately rec’d to all my friends, regardless of ability. Two thoughts- a version for mugs? Also, bright color options so I can have a hilighter orange to match my aesthetic.

Mx · July 2026

★★★★★

My kid doesn’t spill his drink in his bed anymore so….. it’s a win!

Jason Rumsey · July 2026

All four are five stars, which is worth saying out loud rather than letting you assume we chose them that way. The corpus has three- and four-star reviews in it — too small, expected wider containers, slides a little — and not one of them mentions a bed, so there was no lower-rated bed review to leave out. The third review here is left in full, request and all, because it is the same answer the fit list gives: a handled mug does not seat, we have not solved it, and a page that quietly cropped that sentence would be a page you should not trust about anything else on it.

—Read this before you buy, including the part that costs us the sale

What it will not do.

• It is not spill-proof — nothing on a bed is. It widens the footprint under the drink, which is a real thing and a smaller thing than the ads on your feed are promising you.
• It attaches to nothing, so it cannot steady the mattress. When the bed moves, everything on it moves with it. A knee shifting under the covers, a body rolling over, a dog arriving at speed — those still win, and any page that tells you otherwise is selling you something that does not exist.
• It does not make a duvet flat. On a fold it sits at the angle of the fold. Put it on the flattest thing you can reach, which is usually the mattress beside your hip or a blanket folded down for it.
• It is not a mattress protector and it does not protect a warranty. Own a waterproof protector as well; the warranty exclusions quoted above are the manufacturers’ and nothing sold on this page changes them.
• Handled mugs and stemmed glasses do not seat. The handle lands where the fins grip, and a stem has nothing for them to hold. If tea in a mug is the bedtime drink, buy a nightstand, a clip-on shelf if you have a rail, or the rail holder slotted for a handle.
• It does not insulate. It is a base, not a koozie, and it will not keep coffee warm for the twenty minutes you are horizontal.
• It is not a tray. One drink, one base. It will not carry a plate, a book and a phone the way a bed tray or a clip-on shelf will.

—Ninety nights

Ninety days from delivery, used is fine.

That is roughly ninety bedtimes, which is long enough to find out whether it earns its square inch of the covers or ends up in the drawer with everything else that promised the same thing. If it ends up in the drawer, send it back. Used is fine — we would rather have it back than have you keep something you resent.

—Who makes it

Steadi Labs. One person, in Orange, California.

Scott Rodriguez made the first one after a full drink went over on a soft cushion with three kids under three in the house. It was built for spills, on the kind of surface that gives.

It was not designed for a bedroom in particular. It exists because a wide foot does the same job on a duvet that it does on a couch cushion, and because everything it cannot do on soft bedding is written out above rather than left for you to discover at 3 AM.

We make one thing and we make all of it here — the moulds, the material, the colour runs, everything within about three and a half miles of the shop.

• Steadi Labs — veteran founded and veteran owned
• Designed, injection moulded, picked, packed and shipped in Orange, California
• Patent pending
• 100% BPA free
• 5.2 inches across the foot, about 3.6 ounces

— Scott, Steadi Labs

—Asked and answered

The questions that decide it.

—Still deciding

$14.95, against a mattress Casper lists from $699.

That is the arithmetic, and it is not a hard sum. The warranty that came with the mattress excludes beverage spills by name; the protector that covers them is $109 at list. This is fifteen dollars and it goes back if you do not want it.

If you have a nightstand within reach on your side, keep your money. If your bed has a rail, buy the clip-on shelf — it is the better answer and it is not ours. If you sleep on a platform bed with one side against a wall and you have been putting the glass on the floor, that is the bed this was built for.

The bed is not going to grow a rail.

It was designed to be the softest thing you own, it succeeded completely, and that success is the entire problem. What it can have is a wider, deliberately low thing between the cup and the covers — a smaller promise than the ads make, and the only one this surface allows.

from $14.95 — free shipping on every order

90-day guarantee, used is fine · Made in Orange, California