The best ice bath tub, and how much ice it actually takes

An ice bath tub is a soft-sided or inflatable container you fill from a hose and chill with bags of ice: a fabric or drop-stitch wall, a zip-on insulated lid, a drain valve. No compressor, no filter, no outlet.

That makes it a different purchase from the chilled tubs ranked in the best cold plunge tubs, which is where to go for dated installed costs and a thermostat. This page is the tier underneath, in our cold plunge section: tubs you buy to find out whether you will keep plunging, and the ice, hygiene and safety questions that come with them.

What is the best ice bath tub?

The one whose cover and size match how much ice you are willing to carry:

• Best insulated ice-only tub: The Cold Pod 85-gallon round tub with its full-wrap insulated cover. The smallest volume here, so the least ice per session.
• Tall users: the Bubplay 105-gallon XL, which its listing says fits users up to 6 ft 7 in.
• Add a chiller later: the VEVOR 216-gallon drop-stitch tub, the only one of the three whose listing describes chiller ports.

For the cheapest way in, the 116-gallon Cold Pod XL is already the budget pick on our cold plunge tub rankings, so we have not repeated it here.

Every cell is what the Amazon listing states as of 17 October 2026, not a measurement.

The listings also make health promises for cold water that we do not repeat. What the trials support is graded on our cold plunge benefits page.

Portable ice bath: what folding costs you

A wall that folds into a carry bag cannot be a thick insulated shell, so the cover does most of the work, which is why the Cold Pod bundle’s full-wrap jacket is its reason to be here. What you gain: each of these drains, dries and packs away, so a two-week habit ends up in a closet, not a landfill. What you give up is cold water that lasts. No listing says how fast its water warms, and we have not measured it, so plan on fresh ice every session.

Inflatable ice bath: ring and rods, or drop-stitch

There are two ways an inflatable stays up. Ring and rods (the Cold Pod and the Bubplay): a fabric wall held up by a ring of air at the top and supports pushed into sleeves. The rim is the softest part, not a seat or a handrail. Drop-stitch (the VEVOR): internal threads tie the two faces of the wall together, the construction used in inflatable paddleboards, so it pumps hard and stands on its own. Either way, set it on flat, level ground with nothing sharp underneath; a pebble under 800 lb of water is how a puncture starts.

How much ice for an ice bath?

About 80 lb of ice at 32°F takes 100 gallons from 60°F to 45°F, by heat-balance arithmetic. The working, so you can redo it for your tub:

1. Water weight. A gallon weighs 8.34 lb, so 100 gallons is 834 lb.
2. Heat to remove. Cooling a pound of water by 1°F removes 1 BTU. 60°F to 45°F is 15°F, so 834 x 15 = 12,510 BTU.
3. What a pound of ice absorbs. Melting takes 144 BTU per pound (334 kJ per kg, the latent heat of fusion), and the meltwater warming from 32°F to 45°F takes 13 more: 157 BTU per pound.
4. Ice needed. 12,510 / 157 = about 80 lb.

That is the ideal case: no heat through the walls, the air or the person in it. Every real factor pushes the number up. Ice from a 0°F freezer absorbs about 10% more per pound, which pulls it slightly down.

That table is arithmetic, not a measurement. You will not fill to the brim, since your body takes the space (a 170 lb adult displaces about 20 gallons); warm tap water, a warm day and an open lid all push the ice up. The VEVOR row is the point: twice the tub is twice the ice, every session. It is the one to buy for a chiller, and a lot of bags without one.

For your own tub. The ice bath ice calculator runs the same arithmetic for any volume, tap temperature and target, with an adjustable allowance for heat that leaks in while you fill and wait, and turns it into bags and cost per session.

How cold does an ice bath get, and how long does it stay cold?

In a home tub, usually 40 to 55°F, the range our temperature guide gives for ice by our arithmetic, not the 32°F people picture: the walls, the air and you keep adding heat while the ice melts. How long it stays cold depends on the cover, the ambient and the sun, and nobody publishes it. Read a thermometer at mid-depth before you get in rather than trusting the bag count.

Ice bath tub vs cold plunge with a chiller

An ice bath tub is cheap to start and costs ice and a store run every session. A chilled plunge costs far more up front, then holds a set temperature and is always ready. Where the two cross depends on your tap temperature, your target and what a bag of ice costs you; the ice calculator puts a number on it for your tub, and the running-cost page has the chiller side. If you are plunging three times a week on ice, look at the chilled tubs on the rankings page, or at the Ice Barrel review, whose 300 runs on ice with chiller ports built in.

Can you add a chiller later?

To the VEVOR, yes: the listing says its G1/2 in fittings and adapters suit most water chillers. To a tub without ports, only with a chiller that drops a submersible pump into the water and runs hoses over the rim, which means a lid that closes around them; our chiller guide lists one that ships with a submersible pump. Before you plan on it:

• Size the chiller for the gallons. 216 gallons is past the top of the 1/3 HP row in the guide’s sizing table, which puts 130-plus gallons at 1/2 HP.
• A soft wall makes it work harder. Insulation and lid seal decide running cost more than horsepower does.
• The electrics change. A chiller beside an inflatable tub needs a dedicated GFCI-protected circuit, not an extension cord, and that is a job for an electrician.

Keeping the water clean without a filter

None of these tubs has a filter, pump or ozone, so the water is only as clean as the last fill. Shower before you get in, keep the lid on between sessions, and change the water roughly weekly with regular use, the interval our running-cost page uses for an unfiltered tub, or sooner if it turns cloudy, smells, or the walls feel slimy. Drain and dry it fully if it will sit unused.

We do not give a sanitizer dose. The CDC’s guidance for operating public pools and hot tubs sets a minimum of 3 ppm free chlorine or 4 ppm bromine, at pH 7.0 to 7.8, for public hot tubs. It does not mention cold plunges, and a warm public spa is not the same problem as a cold tub one person uses. If you sanitize, use a product labeled for spas, follow the label, test with strips, and never mix chemicals.

Freezing, draining and where the tub can sit

Freezing. The Bubplay listing says to use it indoors below freezing. The VEVOR’s -4°F rating is for the fabric, not a promise that the valves and ports survive a block of ice, and water expands as it freezes. Read all three the same way, as the chiller guide does for chillers: below freezing, drain it or bring it in.

Draining. Gravity-draining a hundred gallons through a hose is slow, so plan the route before you fill. Weekly dumps on one patch of lawn kill it, as the running-cost page warns, and if you have added sanitizer, check local rules before sending it to a storm drain.

Floor load. At 8.34 lb a gallon, 100 gallons is about 834 lb before the tub and the person in it. A full VEVOR is about 1,800 lb of water on about 13 sq ft, roughly 155 lb per square foot with an adult inside. On a ground-level slab or level ground, that is fine. Upstairs, on a deck, a balcony or over a crawlspace, it is a question for a contractor or structural engineer; our Ice Barrel review works through it for a rigid tub.

Getting in and out of a soft-sided tub

Exit is where people fall, on cold legs and numb feet onto a wet floor. Do not push down on the rim: on a ring tub it is air, and any soft wall can fold under a hand. Use a stable, non-slip step if the wall is above your knee, a rubber-backed mat on any hard floor, and something solid to hold that is not the tub.

Ice bath safety: cold shock, children, pets and slips

The bather risks are those of any cold plunge, and the rules match our benefits page:

• Cold shock is the main risk. Tipton (Clinical Science, 1989) described the involuntary gasp, fast breathing, racing heart and jump in blood pressure in the first moments of cold immersion, and judged it responsible for most open-water immersion deaths. Enter slowly and let the gasp settle before you sit to the neck.
• Never alone. Someone at home who knows you are in. If someone is unresponsive in or after a plunge, call 911.
• Head above water. Shattock and Tipton (Journal of Physiology, 2012) describe how cold on the face with a held breath pulls the heart rate in opposite directions at once, a clash that produced irregular rhythms in healthy volunteers. Do not dunk your head.
• No alcohol, and a clinician first with any heart, blood pressure, breathing or seizure condition, or in pregnancy.
• Children and pets. The CPSC’s Pool Safely sheet, “Portable Pools: Fence Them! Cover Them! Put Them Away!”, says to empty smaller portable pools after every use, cover larger ones when no adult is present, and fence them. An ice bath tub is a small, deep portable pool: empty it after each session if children or dogs can reach it, or keep it behind a locked door or fence.
• Slips and cords. Meltwater and splashes wet the floor, and numb feet do not feel it. No cords near an ice-only tub; a chiller goes on a GFCI-protected circuit.

What we have not measured

We have not set up, filled or sat in any of these tubs. Every capacity, dimension, fabric spec, height limit and port size here is listing-stated, and the ice quantities are heat-balance arithmetic, not weighed results. We do not know how fast any of these covers lets the water warm, which decides how many bags an ice-only owner buys.

The test we would run, on one unit of each tub: fill to a measured volume through a flow meter on the hose and record the start temperature, then add a weighed load of bagged ice. Two waterproof probes on a data logger, one at mid-depth and one 2 in below the surface, log every 5 minutes, with a third logging the air beside the tub. Run it with the cover on and with it off, from the same start temperature and ice load, and report hours below 50°F and below 55°F per bag of ice. That also checks the 80 lb figure against a real tub. One unit each, so n=1: a result describes our tub on our day, not every unit sold. It sits beside the chiller display test already owed, and our how we test page says the same about every figure on the site.

What we would buy

For ice-only plunging: the Cold Pod 85-gallon bundle, because the smallest volume needs the least ice and its full-wrap cover is the most insulation on offer here.

Over 6 ft and wanting to sit to the neck: the Bubplay 105-gallon XL, kept indoors in winter as its listing says.

Already expecting to want a chiller: the VEVOR 216-gallon drop-stitch tub, bought for its ports with the ice bill understood, after checking who is selling it.

Plunging three times a week and tired of carrying bags: skip the inflatable and read the best cold plunge tubs and what a cold plunge costs to run.