This page contains affiliate links, and that means that I may earn a commission if you buy something, at no extra cost to you. You can find my full disclosure policy here.

See the 17 tests

1. In the box
2. Thickness
3. Dimensions
4. Side walls
5. Surface
6. Bounciness
7. Valves
8. Inflation
9. First-time inflation
10. Deflation
11. Smart Pack Sack
12. Portability
13. Insulation
14. Tent sizing
15. Materials, foam & seams
16. Air retention
17. The mini-pump
18. Pros, cons, recommendations
19. Bonus: Must Read!

In the Box

I bought my MegaMat Duo 10 in a Medium Double, at full price. Here’s what came in the box:

• The MegaMat, inside a stuff sack
• A mini-pump
• Instructions
• A repair kit

Thickness

• Thickness 4.0in
• Loft Foam and air

Inflated a little softer, which is how I like it, my body never touched the ground on my back, stomach or side, and I couldn’t feel it leaning on an elbow either.

I could feel the ground a little when sitting down, though it was still comfortable because of all the foam. Make it really firm and I can’t feel the ground in any position.

I prefer it softer, because then the foam contours to my body and supports it properly. Even very firm it never felt stiff.

Dimensions

• Length 73.5in
• Width 42.5in

It’s much smaller than a Queen or even a Full, especially in width, basically just two regular sleeping pads put together.

Not the most spacious, but I found the Medium Double plenty comfortable for two.

Side Walls

The side walls are vertical, which maximizes the sleeping space.

Surface

The sleeping surface is flat rather than baffled. The laminated polyester fabric is soft against the skin and isn’t noisy when I move around in bed.

Note Is it as comfortable as your bed at home? That depends on your bed. Mine is a new, really plush, hotel-like bed, so no. But several people I’ve loaned this to said “whoa, this feels like a normal bed”.

Bounciness

Bouncing is very minimal even with another person sharing it, which is one of the benefits of a self-inflating mattress over an air mattress. My REI Camp Dreamer Double was exactly the same.

Valves

• Valves 2 FlatValves, both labeled
• Position Along the side wall at the foot, low profile and flush
• Deflation valve Slightly larger, for a quicker deflation

The valves are good quality, and I had no issues with air leaking in the weeks I used it.

Inflation

Pull the flap off the Inflation valve. It’s a 1-way valve with an attached toggle you can push into it for a faster inflation.

Leave it 10 to 15 minutes and it reaches about 85% of full firmness. How fast it gets there depends on how you store it:

How it’s stored	Self-inflation time
Unrolled with the valves open, as Exped recommends	5-10 min
Rolled up in the stuff sack for weeks	15-30 min

If you like it really soft you may not need to add any air at all. To firm it up, take the toggle out and pop the mini-pump onto the valve.

I use my foot in taller tents because it’s much easier, and my hand when the tent is too low.

• Pumps for my preference ~10
• Pumps for very firm Up to 30
• Time to pump 30 s to 1 minabout 1 second per pump

If it ends up too firm, open the Inflation valve again and press gently to release the built-in flap, which lets a little air out.

First-Time Inflation

• Self-inflation, first time 1 hr
• Pumping afterwards 3-5 min

Exped then recommends leaving the mat inflated for 24 hours so the foam can recover. I didn’t do that, and mine is fine.

Deflation

Pull the flap off the Deflation valve. That’s the slightly larger one. Then fold the MegaMat in thirds, put your whole body weight on it, and halve it to get as much air out as possible.

• Pushing the air out 1 min
• Folding up 1 min 45 s
• Total 2 min 45 s

I can deflate, fold and store it entirely on my own in that time, though I’ve done it dozens of times over the past year. A brand-new mat that isn’t broken in will take a little longer.

Smart Pack Sack

The stuff sack is a sidewinder bag with a roll-top, so the mattress goes back in easily even when it isn’t fully deflated.

There’s a small inside pocket where I keep the mini-pump and the repair kit.

It has a shoulder strap, no loose threads, and the roll-top lets me pack the MegaMat away as tightly or as loosely as I want.

Portability

• Packed size 23.0 x 11.0 x 10.0inthe smallest I could get it
• Weight 7.2lbs (mattress only)
  • Mini-pump 1.6oz
  • Stuff sack 5.3oz
  • Repair kit 0.6oz

Packed size depends on how you fold it and how much air you push out. I fold it in half before rolling, gripping the sides while pushing air out with my knees and body weight.

• First roll 45 s
• Second roll 30 s
• Into the sack, pump stowed, buckled 30 s
• Total 1 min 45 s

Insulation

• R-value 8.1
• Seasons All seasons, including winter

I only used it in temperatures of 60 to 80°F and never felt too hot, though I’m a cold sleeper who likes it warm.

It’s too heavy and bulky for backpacking, so this is a car-camping mattress.

Tent Sizing

In my Coleman 2-Person Sundome it doesn’t fill the whole floor, so there’s room for gear at the sides. It doesn’t reduce livable space at all, with plenty of room to sit up and crouch, and there’s space to pop the mini-pump in when topping off.

In my Coleman 4-Person Dome there’s room for two Medium Doubles with a bit of space left over for gear, and enough headroom to almost stand up.

Materials, Foam & Seams

• Top 50D nylon with a polyester laminatevery smooth and very soft
• Bottom 75D polyesterless smooth, more rugged, for added durability

• Foam Polyurethane, self-inflating
• Seams Welded

The foam recovers well even after months in storage.

I sometimes pick the MegaMat up carelessly by one end, and the seams have never split on me.

Air Retention

Air retention is very good. I slept on it with another person (300+ pounds together) three nights in a row without topping up any air at all, and I’ve used it on my own for weeks at a time without topping up either.

The Mini-Pump

The mini-pump looks small but does the job very well. Seal the hole in the middle with your hand or foot as you press down, then lift right off it so the pump can suck more air back in.

I’ve stored it deflated inside the stuff sack for months at a time and the foam inside has never lost its shape or its pumping ability.

Pros, Cons, Recommendations

Would I recommend the Exped MegaMat Duo 10?

Super comfortable

It’s crazy plush and super soft, and the flat surface means no dips or contours poking into your body. The fabric is quiet and bouncing is super minimal.

Warm enough for winter

At R 8.1 this is well insulated enough for all four seasons.

Very easy to use

Separate valves for inflation and deflation, an easy mini-pump, effortless firmness adjustment, and a sack big enough to store it even when it isn’t fully deflated.

Versatile

The Medium Double is a very nice size. It’s just two regular mats wide, so it fits every 2-person tent, and two of them fit a 4-person tent.

Incredibly high quality

From the pad, its seams and valves to the pump and stuff sack, and it’s backed by a 5-year warranty.

Expensive

This is the priciest mattress I own, and that’s the single biggest thing standing between it and a blanket recommendation. I put it head to head with the REI Dreamer Double, which cost less until REI discontinued it.

A little bulky

Like every self-inflating mattress, it’s too bulky for backpacking.

Bonus: Must Read!

Every figure above is from my own testing. Measured by hand, bought with my own money.