By Will Rietveld and Janet Reichl
Overview
When a backpacker is looking to save weight by purchasing a
lightweight tent, she typically compares tent weight and features. A double
wall tent is usually preferred by lightweight backpackers, and for a two person
model, two side entry doors with vestibules is the most convenient. Nowadays,
there are several two person double wall tent models weighing less than 4
pounds to choose from.
One way to go wrong in choosing a lightweight tent is
overlooking tent dimensions and specific features. Some manufacturers make
their tent lighter by making it smaller, for example, only one entry for a
2-person tent, less floor area, less headroom, and fewer features. Personally,
I don’t like to play that game; I want a 2-person tent that’s roomy, fully
featured, and lightweight.
Nobody does that better than Big Sky International. The
Evolution 2P is a full-size free-standing roomy 3-season 2-person double wall
tent with two doors with vestibules, four storage pockets, and total weight
less than 3 pounds. And that weight includes stakes and aluminum poles.
The Big Sky International Evolution 2P tent weighs just
3 pounds, yet it’s roomy inside, full-featured, and well-designed.
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Specifications
Model
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Evolution 2P (Revision J)
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Configuration
Tested
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SuprSil UL fly, mesh interior with clips, UL DAC aluminum
poles, 8 stakes in sack (2 tubular stakes for vestibules and 6 titanium
shepherd hook stakes), storage compression sack
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Weight
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3 pounds, 0.35 ounces (includes mesh interior, fly, poles,
8 stakes in stuff sack, 4 guylines, compression storage sack
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Floor Dimensions
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91” long x 53/47” wide x 42” high (verified) Area is 31.6
sq ft
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Features
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Two side entry doors with vestibules, large mesh interior
doors with 2-way zippers, 4 interior storage pockets, two closable top vents
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MSRP as Tested
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$472
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Other Options
Tested
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ShelterSaver groundsheet, grommet kit
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Description
Most Big Sky International tents are purchased ala carte,
meaning that for each tent component (fly, poles, stakes, etc.) you have a
choice from a list of options. As one would expect, the lightest options (such
as UL fly fabric and composite poles) cost more to reduce tent weight. This is
a really nice approach for knowledgeable buyers, because it allows them to
purchase the exact configuration they want. Although the process can be a bit
daunting for inexperienced buyers, choosing the basic configuration still
results in a very lightweight tent. Hopefully this review will help with those
decisions.
The Evolution 2P double wall tent is Big Sky’s flagship
model. It first came out around 2005 and is now in Revision J, that’s nine
updates since its initial introduction. Big Sky continually updates their tents
to incorporate lighter and better components as they become available, and
adjust the design. So, the current model is very refined.
The Evolution, like other Big Sky tents, is made of
silnylon, which is silicone impregnated 1.3 ounce per square yard ripstop
nylon. Big Sky offers two weights of silnylon, or SuprSil as they call it.
Regular SuprSil is equivalent to regular Silnylon at about 1.3 ounces per sq
yd; SuprSil UL is the lighter version at about 1 ounce per sq yd. There are
many versions of silnylon, and the one that Big Sky uses is very high quality.
Another interesting point is that Big Sky tents do not need
to be seam sealed like other silnylon tents. I tested that claim with a garden
hose spraying 30 psi directly at the seams, without any leakage.
Side View.
Both sides of the tent have a large vestibule and entry door, plus a large top
vent. Door closed (left), doors open (right).
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Floor dimensions are generous by lightweight standards: 91
inches long x 53/47 inches wide head/foot x 42 inches of headroom (verified).
Since the floor is slippery silnylon, it’s a good idea to paint stripes of
silicone across the floor. Use McNett SilNet and dilute it with paint thinner
to the consistency of pancake syrup, then paint it on. The seams on a Big Sky
tent do not need seam sealing, which is a big plus.
The Evolution’s floor fabric is 30-denier silnylon. If you
would like a more durable floor, order the Evolution 2P with the Eclipse 2P
interior. The Eclipse has the same dimensions as the Evolution but has a
40-denier floor (polyurethane-coated ripstop nylon, seam taped); the heavier
floor fabric adds 7.65 ounces to the weight.
My test tent came with the compact UL DAC Featherlite aluminum poles,
which fold to a 14.25 inch length, a $7 upgrade. These poles are more compact (3
inches shorter) and weigh 0.2 ounce more than Big Sky’s
standard 17-inch UL DAC aluminum poles.
Field Testing
We tested the Evolution 2P on a number of summer backpacking
trips in the southern Rockies, where we experienced lots of weather conditions
including warm/calm nights, heavy rain followed by a calm night, strong winds,
plus a few bugs thrown in for good measure.
Setup – Setup is
easy and fairly fast, but not as fast as a single wall tent. 1) Lay the inner
tent on the ground in the orientation desired (black stakeout loops on the head
end) and stake the corners. 2) Lay the poles across the tent and connect one
end to the grommets (or slide the poles through the sleeves if you have a tent
with pole sleeves). Arch the poles and connect the other grommet ends. 3)
Attach tent clips to the poles. 4) Lay the fly over the top (again, black
stakeout loops on the head end) and hook to loops at the corners. 5) Stake out
the vestibules. 6) Go inside and connect eight Velcro loops on the fly around
the tent poles. And 7) stake out the four corner guylines and end/center
guylines, using the four stakes originally used on the corners.
This full setup requires 8 stakes. We recommend a pair of
tubular stakes for the vestibules and titanium shepherd hook stakes for the
guylines.
The full setup, as described above, provides a bomber pitch
ready for strong winds and wind-driven rain. It also fully extends the mesh
interior so it doesn’t contact the fly, and allows maximal ventilation. For a
quick pitch in good weather and a protected location, the tent can be secured
with only two tubular stakes on the vestibules. However, in unpredictable
backpacking conditions and to optimize the benefits of a double-wall tent, its
best to go with the full setup.
Wind Stability and
Ventilation – For good wind stability, it’s essential to attach the eight
Velcro tabs on the fly to the poles. Also, we highly recommend getting the
guyline kit when ordering the tent, and using them to secure the four corners
of the tent. This requires some extra effort, but it results in a much sturdier
pitch and tensions the interior mesh. Bottom line, the tent performs at its
best if you do this.
Without the full setup (Velcro tabs not used, no guylines),
in a strong wind the poles slide under the fly and the tent deforms badly,
springing back after a gust. With the full setup the tent is rock solid.
The combination of a raised fly (about a 6-inch gap above
the ground all around the tent) and two top vents provides maximal natural
ventilation. This is as good as it gets. In good weather with a low bug count,
it improves ventilation a lot to leave the inside mesh doors open at night.
Under ideal conditions you can tie all the doors open for maximal ventilation
and some star gazing.
Livability – The
Evolution 2P has plenty of room inside for two people plus gear, and headroom
is abundant. Note in the photos above that the head end is very steep, and the foot end is also a very high angle. This means that essentially all of the interior volume is usable. The floor is 90 inches long and 53/47 inches wide (measurements
verified) so there is extra space between the occupants and at the foot of the
tent. Four really large storage pockets in the corners hold numerous smaller
items to keep them handy. When the inside mesh doors are tied back, the interior
of the tent really opens up, adding the space in the vestibules within easy
reach
Mesh Tent Only Option – In good weather, pitching the tent’s mesh interior only provides protection from bugs and creepy crawlers, and allows some good star gazing. Simply set up the mesh interior with the poles and skip the fly.
Assessment
The Evolution 2P is not the very lightest 2-person double
tent to be found anymore. At almost 3 pounds, it’s a few ounces heavier than
some of the newest lightweight tents featured in my Summer 2013 Outdoor
Retailer Show shelter coverage in the blog post following this one.
What is hard to find however, is a lightweight tent that
gets everything right. Many of the lightest tents are missing something – they
have only one entry door, small floor area, small vestibules, no top vents, low
headroom, or they use exotic materials that are very expensive. Frankly, it’s
hard to find a tent that gets everything right.
The Evolution 2P is such a tent – it gets everything right.
It’s easy to enter, roomy inside for two people, has great livability, lots of
storage in pockets and vestibules, has great ventilation, and is very
storm-worthy and wind stable (if you do a fully secured pitch, as described
above). The Evolution 2P has received nine upgrades over the past eight years,
so it’s very dialed in to make it as good as it can be. And the $450 cost (with
options) is reasonable compared to other high quality tents.
The only downside of the Evo 2P is the time it takes to set
it up securely. The extra setup time is due to its double wall design; a single
wall tent like the Mirage 2P is significantly faster to set up.