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Marmot Fortress UL Tent: 3-Person 3-Season

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Why We Like The Fortress UL Tent

A big reason why we like the Marmot Fortress UL Tent so much is due to the fact that it's equally low on weight and high on space. It is large enough room for three backpackers or two campers and a dog. DAC Pressfit poles are pre-bent to provide greater living space, and the rain fly keeps you and your gear nice and dry during rainy weather. The mesh canopy offers plenty of ventilation in warmer weather. There's a pocket inside that helps headlamps illuminate the inside of the tent.

  • Ultralight tent suitable for backpacking in a party of three
  • 3-season versatility pairs a rain fly with a full mesh canopy
  • DAC Pressfit poles pre-bent to create vertical walls
  • Dual doors with vestibules for gear storage
  • Color-coded clips pair with poles and fly for easy setup
  • Lampshade pocket helps headlamps illuminate the interior
  • Item #MARZ9GY

[fly] 20D polyester ripstop, PU coating (1200mm), [canopy] 20D nylon ripstop, nylon no-see-um mesh, [floor] 30D nylon ripstop, PU coating (2000mm)
Wall Type
DAC Pressfit (9.0mm)
Pole Attachment
Number of Doors
Number of Vestibules
Vestibule Space
10.6sq ft / 7.8sq ft
top vent
fully sealed
Interior Height
Floor Dimensions
41.5sq ft
Floor Space
66 x 90in
Packed Size
22 x 8in
Trail Weight
4lb 15oz
Packed Weight
5lb 5.5oz
backpacking, weekend camping
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 5

Great 3-4 season option

I've used it several times
True to size
Size Bought
6` 2"
200 lbs

Bought it this past Jan and have used it 4 times. It has done very well, including in wet snow. The full 2 layer doors are nice and make it almost functional into summer. The zippered lower vent is great to try to get air flow at the level you are at when sleeping. The top vent on the inner roof is curious that it has no mesh but somewhat understandable in a UL tent (what side would you put the mesh on?). It does vent condensation well in late fall/winter/early spring cold weather where bugs are not a concern, but limits use in hot/humid summer weather where high venting is still needed. However, I guess Marmot figures that is where a tent like the Tungsten 3, with its high mesh ratio, would be better to use. Since any one tent is rarely useful in all conditions, I do not count this against the Fortress. I actually consider it a great 3 season tent- Fall, Winter (into medium level snow) and Spring. I bought the heavier Fortress footprint since the UL version was not available when I bought it. I actually like this combination since it provides better floor protection where I worry about a UL tent the most. If I want to go lighter I just bring my Tyvek homemade version, but most of the time if its going to be rocky I want the extra protection against the ground. The storage is decent in this tent though a big mesh panel at the foot could be great, as in many newer UL tents now. But I did attach lines to the upper attachment points and that lets me hang wet clothing. The vestibules are pretty good sized and my wife likes the smaller back one for her since it eliminates the awkward long reach to grab the zipper in the middle of the night! Overall, this tent is a little baffling to me at this point. Why is it not getting much internet attention? The regular version seems popular enough but since cold weather gear is so much heavier I would think a UL version would be even more valuable. This version is well built and feels like it will be durable and as I said above did pretty well in some wet snow. I did work to keep the snow from accumulating too much on top but that would seem prudent to do even in a heavier tent and the material never seemed stressed. Hope this can last as I like the weight, size, layout and even the bright color for shoulder season and cold weather camping.


Is the packed weight of this tent really 5 lb 5 oz? Seems too low.


What would be the best footprint to use with this tent?