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AntiGravityGear O2 Tent Review

This new single wall tent provides convenience and ventilation, plus loads of room for one person and gear and can accommodate two people when needed.


Overall Rating: Recommended

Although the AntiGravityGear O2 tent is rated as a two-person tent, it is best used as a one-plus-person tent, and only occasionally as a two-person tent. I am rating it in that context. The O2 provides a huge amount of room for one person plus gear while keeping weight down to only 28 ounces. It has a convenient side entry protected by a large zippered vestibule and a large rear vent to provide good flow-through ventilation. However, as a two-person tent, the sleeper in the back has limited headroom and has to climb over the person in front in order to enter or exit the tent.

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by Will Rietveld |


AntiGravityGear O2 Tent Review - 1
The AntiGravityGear O2 is a roomy one- or two-person single wall silnylon tent with side entry and trekking pole support.

The new AntiGravityGear (AGG) O2 tent evolved from the AGG Tarptent. The footprint and canopy are basically the same, but the front entry and back of the tent have been substantially revised. While the AGG Tarptent (which is still available), at 23 ounces, is a lightweight and roomy shelter for one person and plenty big for two, its major shortcoming is excessive interior condensation due to inadequate ventilation. The O2 is designed to overcome that problem and add some convenience features; how well does it succeed?

As mentioned, the footprint and canopy of the AGG Tarptent and O2 are virtually identical. The canopy is one piece of fabric, so there is no ridge seam to seam seal (or leak). However, the lack of canopy seams creates a tent with a lot of loose fabric that needs to be pulled outward with back and side pullouts in order to maximize interior volume.

The design changes in the O2 are at the front and rear. The front has a large zippered vestibule and a mesh entry wall with large zippered entry door. The rear has a large mesh panel for extra ventilation, with a zippered closure on the inside and large overhang on the outside.

AntiGravityGear O2 Tent Review - 2
Views of the AntiGravityGear O2 tent. The front of the tent (top left) has a large zippered vestibule that extends almost to the ground. The rear (top right) is extended by a tieout cord attached to a trekking pole and then to the ground. A side view (bottom left) shows one side of the vestibule open and tied back. Each side has a tieout cord that can either be staked directly to the ground (shown) or extended to a branch found onsite and then staked to the ground. The top view (bottom right) shows the tent's shape; the front of the tent is at the bottom of the photo.

AntiGravityGear O2 Tent Review - 3
Inside the AGG O2. Note that the front of the tent is supported by a trekking pole angled to the side. Entry is through a large zippered mesh door. The rear of the tent has a large mesh panel to provide flow-through ventilation.

The front of the tent has a PVC plastic cap that a trekking pole tip inserts into, which is safer protecting against slippage compared to a grommet, especially with worn tips. There are four front vestibule positions: it can be fully open (first photo), it can be completely closed (second photo, top left), one side can be tied back (second photo, bottom left), or half of each side can be tied up (below) for more ventilation.

AntiGravityGear O2 Tent Review - 4
The O2's front vestibule can be set at half height position for extra ventilation.

I tested the AGG O2 tent on a number of summer trips in mountain and desert country. As a solo tent, the O2 is luxurious, with loads of room in both the tent and vestibule. Because of the side entry and lower headroom in the back, the O2 requires some logistical plannng for two sleepers. It works best if the person sleeping in the back of the tent gets settled in before the second person enters. For midnight relief, the person in the rear has to climb over the person in the front to exit the tent. Also, headroom is more limited in the rear of the tent, so it is more cumbersome to enter and exit a sleeping bag, especially if the tent walls are wet. Keeping the back and side pullouts taut is vital to maximize the volume inside the tent.

While two people can adjust to sharing the O2 tent, a side entry tent is simply more convenient if it has two doors and two vestibules. Alternatively, a couple can choose a tent with an entry at one end. In either case, one person can exit the tent without disturbing the other. Considering this, the best use for the AGG O2 is as a one-plus-person tent, providing plenty of room for one person plus gear, and only used occasionally two people.

In rainy weather or buggy conditions, the AGG O2 provides a lot of security for minimal weight. The tent completely seals up to exclude bugs. The vestibule on the front and the rear overhang provide plenty of protection so the tent can be ventilated to the max during a rainstorm. If wind and bugs permit, opening the front mesh door really helps to increase ventilation and minimize condensation.

AntiGravityGear O2 Tent Review - 5
In spite of its better ventilation, the AGG O2 tent is not exempt from condensation on the inside walls on a clear/cool/calm night. This photo was taken on a 32 F morning while camped at 12,200 feet in the southern Colorado Rockies.

In windy conditions, it helps a lot to orient the back of the O2 tent into the wind. The back vent has a zippered closure, so the amount of breeze passing through the tent can be regulated. However, the O2 is not particularly wind stable. Because of its loose canopy, secured by three pullouts, the tent flaps a lot in the wind and even buzzes during stronger gusts. The front vestibule helps to deflect wind from the front, and fully zipping the mesh entry door and back vent closure helps to reduce the amount of air flowing through the tent.

For comparison, the AGG O2 is similar to the Six Moon Designs Lunar Solo (25.4 ounces trail weight, US$235). It has an extra 10 square feet of floor space and weighs about 2.6 ounces more. However, (in my opinion) the Lunar Solo is better ventilated, more wind stable, in addition to having a floating bathtub floor.

Overall, the AGG O2 provides a lot more room for its weight than most other single wall tents, and is reliable shelter from storms and bugs. Its condensation resistance is average for a single wall tent, but it is not particularly wind stable.



AntiGravityGear (


2008 O2

  Shelter Type:

One or two-person single wall tent with side entry


Requires trekking poles


Eight 6-inch titanium shepherd hook stakes (not included)


Canopy and floor are 1.3 oz/yd2 silnylon, entry wall and rear vent are mesh


Trapezoidal, floor is 9 feet in back tapering to 7 feet in front, 55 inches deep, front height is 43 inches, rear height is 24 inches

  Protected Area:

Floor 36 ft2, vestibule 10 ft2


Large zippered front vestibule, mesh entry wall with large zippered door, back mesh ventilation panel with zippered closure, one piece canopy (no top seam), trekking pole support


Total weight 1 lb, 12.6 oz (includes seam sealed tent, eight titanium stakes, tent stuff sack, stake sack); trail weight (includes tent, stakes) 1 lb, 12 oz; manufacturer specification 1 lb, 12 oz total weight




Seam sealing US$30


"AntiGravityGear O2 Tent Review," by Will Rietveld. (ISSN 1537-0364)., 2008-11-18 00:05:00-07.


Reader Comments

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AntiGravityGear O2 Tent Review
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Addie Bedford
(addiebedford) - MLife

Locale: Montana
AntiGravityGear O2 Tent Review on 11/18/2008 19:01:56 MST Print View

Companion forum thread to:

AntiGravityGear O2 Tent Review

Mary D
(hikinggranny) - MLife
AntiGravityGear O2 Tent Review on 11/20/2008 00:33:25 MST Print View

I am seriously considering this tent. Does anyone else have any experience with it?

Rog Tallbloke
(tallbloke) - F

Re: AntiGravityGear O2 Tent Review on 11/20/2008 01:11:09 MST Print View

Having no seams is great for not having to seam seal, but the side and rear pullout attachments do look vulnerable to stress in a heavy wind. How are the interior reinforcements done?

Eric Blumensaadt
(Danepacker) - MLife

Locale: Mojave Desert
I Dunno... on 11/23/2008 12:21:57 MST Print View

To me it looks like there are too many external, pole-supported pullouts needed and the pitch time would be longer.

I own a TT Contrail. It seets up fast, adjusts quickly to more or less ventilation (higher or lower pitch, etc.) and has decent wind shedding ability when all guylines are used. Speaking of ventilation, it has excellent air flow, even in heavy rain.

I'll stick with the Contrail for now.