Quick Answer: A double mattress in a box (also called Full size, 54" x 75") is a compressed mattress shipped to your door in a box. In Canada, expect to pay $300 to $900 for a quality double bed-in-a-box. They take 24 to 72 hours to fully expand after unboxing and work on any flat, solid surface.
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What Is a Double Mattress in a Box?
A mattress in a box is exactly what it sounds like: a full-size mattress that has been compressed, vacuum-sealed, and rolled into a box for shipping. When you open the box and remove the plastic wrapping, the mattress expands to its full size over 24 to 72 hours.
The "double" part refers to the mattress size. A double (also called Full) measures 54 inches wide by 75 inches long (137 x 191 cm). It is 6 inches wider than a Twin but 5 inches shorter than a Queen. The "in a box" part refers to the delivery method, not the mattress quality. Many reputable Canadian mattress brands now sell compressed mattresses that are identical in construction to what you would find in a showroom.
The compression process does not damage the mattress when done properly. Modern foam and hybrid mattresses are designed to be compressed and recover their full shape. A 2019 study in the Journal of Testing and Evaluation found no measurable difference in firmness or durability between compressed and non-compressed foam mattresses after a 30-day recovery period.
Important distinction: Not every mattress can be compressed. Traditional innerspring mattresses with thick coil gauges cannot be safely rolled without damaging the springs. Bed-in-a-box mattresses use either all-foam construction or hybrid construction with thinner, individually wrapped pocketed coils that flex during compression. If you are comparing a bed-in-a-box to a traditional mattress, our foam versus coil mattress guide explains the structural differences.
Who a Double Size Suits Best
A double mattress works well for:
- Single adults who want more room to spread out than a Twin provides. At 54 inches wide, a Double gives one person a generous sleeping surface.
- Guest rooms where a Queen would overwhelm the space. A Double fits in bedrooms as small as 9' x 10' with room for a nightstand.
- Teenagers transitioning from a child's bed who do not need (or have room for) a Queen.
- Apartments and small bedrooms where floor space is at a premium.
A Double is a tight fit for two adults. At 54 inches, each person gets only 27 inches of personal width, which is less than a Twin gives a single sleeper. If you are shopping for a couple's bed, a Queen (60" x 80") is the practical minimum. Our mattress size guide has a full comparison of all sizes with room dimensions.
Double vs Full: These are the same thing. "Double" is the traditional Canadian term, "Full" is more common in American marketing. If you see a "Full" mattress online, it is the same 54" x 75" dimensions as a Double. Sheets, protectors, and bed frames labelled "Full" or "Double" are interchangeable.
What to Look for When Buying
Foam Density
This is the single most reliable indicator of mattress quality in a bed-in-a-box. Higher-density foam lasts longer and provides better support. Look for comfort foam with a density of at least 1.5 lb/ft³ and support foam of at least 1.8 lb/ft³. Cheap bed-in-a-box mattresses use low-density foam (under 1.0 lb/ft³) that feels fine initially but develops permanent body impressions within a year or two.
Mattress Height
Most bed-in-a-box doubles range from 8 to 12 inches thick. Thinner mattresses (8 to 9 inches) are lighter, easier to move, and often more affordable. Thicker mattresses (10 to 12 inches) tend to have more comfort layers and better pressure relief. If you weigh over 200 pounds, a minimum of 10 inches is recommended for adequate support.
Certifications
CertiPUR-US certification means the foams have been tested for harmful emissions, heavy metals, and ozone depleters. This is the industry standard in North America. OEKO-TEX certification covers the fabric cover. Both are worth looking for, especially if you are sensitive to chemical odours (the "new mattress smell" that dissipates within a few days).
Trial Period and Return Policy
Most Canadian bed-in-a-box brands offer a 100-night or longer home trial. This is important because you cannot test the mattress before buying online. Read the return terms carefully: some companies require a minimum 30-night break-in period before you can initiate a return, and some charge a return shipping fee.
What Mattress Miracle carries: We stock double mattresses from multiple Canadian brands, including bed-in-a-box options you can try in person before buying. The advantage of testing a compressed mattress in our showroom is that it has already fully expanded, so you feel the actual sleeping surface rather than guessing based on online specs. Browse our full mattress collection or visit us in Brantford to compare.
How to Set Up Your Bed-in-a-Box
Setup is straightforward, but a few details matter:
- Move the box to the bedroom first. The mattress is much easier to manoeuvre in the box than after expansion. Boxes typically weigh 25 to 40 kg for a double.
- Place the rolled mattress on the bed frame or foundation before cutting the plastic. Once expanded, the mattress is difficult to reposition.
- Cut the outer plastic carefully using scissors (not a box cutter, which can nick the mattress fabric). The mattress will begin expanding immediately.
- Wait 24 to 72 hours before sleeping on it. Most reach about 90% expansion within a few hours, but the corners and edges may take a full day or two to fully fill out.
- Expect a slight odour for the first 24 to 48 hours. This off-gassing is normal and harmless for certified foams. Open a window to speed it up.
The mattress works on any flat, solid surface: a platform bed, a slatted bed frame (slats spaced no more than 3 inches apart), a box spring, or even the floor. The only requirement is that the surface is flat and provides consistent support. A sagging box spring will cause the mattress to sag too, regardless of quality.
In-Store vs Online: Which Is Better?
Both have genuine advantages.
Buying online gives you a home trial (typically 100 nights), delivered to your door, often with free shipping across Canada. The downside is you cannot feel the mattress before committing, and returns, while free on paper, require arranging pickup or donation, which can be inconvenient.
Buying in-store lets you lie on the mattress in your natural sleep position and compare it directly to other options. At Mattress Miracle, we carry bed-in-a-box brands alongside traditional mattresses so you can feel the difference. Many customers tell us they came in planning to buy online but changed their mind after testing mattresses in person. The feel of a mattress on a website description versus under your body is often surprisingly different.
If you are leaning toward online but want to understand what you are buying first, our mattress in a box Canada guide covers the full landscape of compressed mattresses available to Canadian shoppers.
For Brantford shoppers: Mattress Miracle is at 441 1/2 West Street. We stock double mattresses starting under $400 and you can test them in person with no obligation. Our team does not work on commission, so the recommendation you get is based on what actually suits your sleep, not what pays the highest margin.
Care and Longevity
A quality double mattress in a box should last 7 to 10 years with proper care. The basics:
- Use a mattress protector from day one. It prevents sweat, spills, and dust from reaching the foam, which extends the mattress lifespan significantly. Our mattress protector collection includes breathable options that will not change the feel of your mattress.
- Rotate 180 degrees every three months. This distributes wear evenly and prevents body impressions from forming in one spot.
- Do not fold or re-compress the mattress. Once expanded, the foam is not designed to be compressed again without professional equipment.
- Use proper support. Ensure your bed frame provides even, solid support across the entire mattress surface. A broken slat or sagging foundation will cause premature wear regardless of mattress quality.
According to research published in Sleep Health, mattress degradation begins to measurably affect sleep quality after about 7 years of nightly use. If you notice persistent body impressions deeper than 1 inch, it is time to start shopping for a replacement.
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Find Your Double Mattress at Mattress Miracle
We carry double mattresses from trusted Canadian brands, including bed-in-a-box options you can try before you buy. Family-owned in Brantford since 1997, with honest advice and no pressure.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
How long does a double mattress in a box take to expand?
Most reach about 90% of their full size within a few hours of unboxing. Corners and edges may take 24 to 72 hours to fully fill out. You can sleep on it the same day in most cases, but the mattress will feel slightly firmer until fully expanded.
Is a mattress in a box lower quality than a regular mattress?
Not inherently. The compression process does not damage modern foam or hybrid mattresses. Quality depends on foam density, materials, and construction, not on how the mattress was delivered. Some of the highest-rated mattresses in Canada are sold as bed-in-a-box products.
Can two adults sleep on a double mattress?
Technically yes, but it is tight. A double is 54 inches wide, giving each person only 27 inches of personal space. A Queen (60" wide) is the recommended minimum for two adults. If space or budget limits you to a Double, it works best for couples who are both smaller-framed and comfortable sleeping close together.
Do I need a box spring with a bed-in-a-box mattress?
No. A bed-in-a-box mattress works on any flat, solid surface: a platform bed, a slatted frame (slats no more than 3 inches apart), a bunkie board, or even the floor. A box spring is optional and not required. If you do use one, make sure it is not sagging or damaged.
What is the best double mattress in a box in Canada?
The best option depends on your sleep position, body weight, and budget. Look for foam density above 1.5 lb/ft³ in the comfort layer, CertiPUR-US certification, and a trial period of at least 100 nights. Visiting a store like Mattress Miracle to test options in person is the most reliable way to find the right fit.