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  • Award-winning mtnGLO Light Technology features LED lights integrated into the tent body, so you can experience ambient light in your shelter with the click of a button
  • LED light strand is durable and flexible enough to withstand repeated tent pitching and stuffing
  • LEDs illuminate the interior of your tent with 90+ hrs. of hands-free light to sort gear, read, eat and play cards without blinding your friends with a headlamp
  • Simple push-button controller has 3 settings: on, off and 50% brightness; requires 3 AAA batteries (sold separately)
  • Symmetric DAC pole structure simplifies setup with Pressfit connectors and lightweight hubs; plastic clips attach tent body to pole frame
  • 2 doors and 2 vestibules with stormflaps on the zippers; Quick Stash makes it easy to stow unzipped doors
  • 2 media pockets located above sleeping area enable clean earbud cord routing from phones or other devices; 4 interior mesh pockets keep small items organized
  • Gear loft loops are compatible with Big Agnes PowerCase mtnGLO gear loft (sold separately)
  • All seams taped with waterproof, solvent-free polyurethane tape (no PVC or VOCs)
  • Reflective guylines and webbing on tent corners
  • Comes with 8 lightweight aluminum hook stakes
  • Save weight and create a minimalist shelter by using just the rainfly, poles and footprint (sold separately)


View all Big Agnes Backpacking Tents

REI membership


Best Use Backpacking
Seasons 3-season
Sleeping Capacity 3-person
Minimum Trail Weight 4 lbs. 11 oz.
Fly / Footprint Pitch Weight 3 lbs. 10 oz.
Packaged Weight 5 lbs. 4 oz.
Packed Size 7 x 21 inches
Floor Dimensions 88 x 70 inches
Floor Area 43 square feet
Vestibule Area 9 + 9 square feet
Peak Height 47 inches
Number of Doors 2 doors
Number of Poles 2
Pole Material Aluminum DAC
Pole Diameter 9.5 millimeters
Canopy Fabric Nylon/polyester mesh
Floor Fabric Ripstop nylon
Rainfly Fabric Ripstop nylon
Design Type Freestanding
Rated 3 out of 5 by from Not their best, but still a pretty good product. I bought this tent based on my experience with the BA copper spur UL3 that is a really great product. This tent doesn't quite measure up to the other. The lighting is cool, seems to work fine, and it is enough to see by at night. We had moderate rain one night and things got a little wet. So I don't think it holds up as well to weather as their other tent. One of my biggest gripes are zippers that require two hands to open. If you zip or unzip the rain fly with one hand, the seam will get stuck in it every time. And it's hard to get unstuck. Zipping the fly requires holding up the overlapping seam with one hand while you work the zipper with the other.
Date published: 2016-07-10
Rated 4 out of 5 by from Almost Perfect Tried this tent out over the weekend for some lazy private campground camping on Chincoteague Island. Only issue with this tent is the door entries are quite small. If you are 6 ft., have broad shoulders, it's a little tight. That's my only complaint. Otherwise the mtnglo feature performed well, setup and packing is a breeze. Nice compact, lightweight tent. Rain fly zippers snag easily too but I had drank a lot of bourbon so maybe user error. ;-)
Date published: 2015-05-06
Rated 5 out of 5 by from Glows in the dark I research tents for over two months before settling on the Big Agnes SL 3 mtn GLO tent. Upon receiving the tent I set it up in the living room. Like a typical guy I didn't even look for directions. It went up unbelievably fast. Under 10 minutes first time without the rainfly or footprint. Last weekend we went for a shakedown campout to check out our equipment getting ready for a R-2-R-2-R. We arrived past dark and I set it up using a headlamp and again it was up 7-8 minutes with the footprint and tent only. Did not need the rainfly. The LED lighting is really cool. Lets you see what you are doing laying out the bedding. I repacked it AM and the whole tent including the footprint fit nicely back in the stuff sack. We did a 9 mile shakedown hike and other than the mosquitoes, ticks and 1 rattlesnake encounter it went perfect. Every pound mattered in my 36 pound pack. I opted for the SL 3 so my wife would be happier in the morning. The SL 2 would be a pound lighter and cost a little less but we had plenty of room and never touch each other, unless we wanted to. It was hot, the high was near 100 with heat index that day and having space is a must, especially with my wife. I had read the reviews on the other problems. The doors were fine for my wife and I. I am 5'10" and she is 5'6". We also had no problems with zippers. The tent was spaced out well with the fitted footprint (a must) and we zipped slowly rather than fast zipping them around. I too had a few adult beverages like the other gent. I did use the rainfly the second night just to check it out. It went on easy, staked out nicely and provided lots of room for gear on either side. The stakes were OK and worked fine but if a better stake is needed I would recommend the MSR ground hog stake. The GLO feature is really a great innovation and the future will tell how long it lasts and we'll see how fast it goes through batteries. I will post again after we have been through wind and rain with a report. We have had a lot of rain here in Oklahoma and Texas. Great tent! Thanks Big Agnes.
Date published: 2015-06-11
Rated 5 out of 5 by from A Palace for Two... Being an East Coast guy, I normally hike with a hammock... Love it: fast up and down and plenty of trees to pitch it. But this spring it has been VERY wet and the G/F implored me to get something with interior space so that we could easily shelter a rainy day away, inside, away from bugs. The hammock keeps us dry and gives us a good night sleep, but you just can't hang out in it. I have an old single wall 1-2 person tent, but it was made for sleeping in only and offers no comfort for chilling on a rainy day. So I started shopping around for a new tent with some room to live and play within. From my past experience with two man tents, I began looking at 2+/3 man tents. During the 4th of July Sale, the Big Agnes mtnGLO series tents were on sale and I locked onto the Rattlesnake SL3. I purchased it online sight unseen with the footprint. The ground in most of my favorite hiking / camping sights is pretty rough (lots of roots and stones), making the footprint a necessity to extent the life of the tent floor. First impression. Of course I saw all the dimensions online, but out of the box the storage bag was a bit larger than I imagined. I have a 65L Osprey backpack. As packaged the SL3 fills one side of my pack from sleeping bag to the top of the pack, but it does fit. With the footprint the tent is about 5lbs (still light for the size), but is only a couple of pounds heavier than my other setups. While I've had to learn to re-pack my bag, I'm happy with the packed size and weight, especially for the price. The tent it's self. When I laid out the footprint, I realized that the tent too was going to be much bigger than I had imagined. 2 man tent designs have obviously come a long way while I've been hanging in my hammock! The tent set up very fast and was intuitive. The rain fly went on easily and has plenty of guy lines to keep it secured in any conditions I would be out in! The material is Very light weight and it's construction is solid. The first time I crawled inside, I realized that this tent inside is easily bigger than the cheapo tent my college buddies and I used to camp in (4 man tent). While the foot print may be smaller, the vertical walls make for a VERY roomy space. Certainly no more than three are comfortably sleeping inside, but 4-5 people could easily hang out inside this tent sitting up (maybe even 6 if your comfortable being cozy). Honestly, the Rattlesnake SL3 is a palace for two! I am absolutely certain (especially after have camped so long with two in a hammock w/ fly), that the SL2 would have suited my purposes! But I'm happy with the extra space. Instead of huddling under a small fly in the rain, the SL3 makes a rainy day just a fun excuse to spend more time in the luxurious tent! There is more than enough room for our gear under the vestibules and the dual doors allow for a lot of flexibility in using the tent. On our maiden trip, we used one vestibule for both our packs and the other for boots and ingress / egress. We woke up to rain. Having hung my camel back from one of the handy tie points on the inside of the tent (There is one placed at every point of contact with the tent and the poles), I didn't have to get out of my sleeping bag to open the tent door and swing back the vestibule door to set up my little stove to boil water for coffee and breakfast! Breakfast in bed made for a very romantic (and very comfortable) start to our day. I the mtnGLO lighting system did not really play a factor in my purchase, but it is worth mentioning. Far from daylight, the LED lighting system does fill the tent with illumination in the dark... Even the 50% setting offered plenty of cool, non-invasive, even lighting to see and do just about anything you really need to do in a tent... We enjoy it. We also like the fact that each corner of the tent has a built in triangular pocket for storing those items from your pockets, headlamps, and other stuff you might need in a pinch. The ventilation is excellent! Two high vents on either end of the fly can be propped open or velcroed closed and the zippers at the tops of the vestibule can also be lowered from the top down for extra ventilation. They offer a lot of versatility and ability to control the air flow through the tent. We found it very comfortable and warm in cool conditions and plenty breezy to be comfortable even in the sun. I'd like to address some of the other concerns I've read about... The tent is noisy: Yes, it is free standing and there is some flex to the frame poles. The tent is also engineered with air flow in mind. I always try to pitch my tents with weather in mind. While I did not have to deal with extreme wind, there is more play in the frame from end to end than there is laterally (from door to door). If i were going to pitch this tent to handle wind, I would face one of the vestibules towards the weather, utilizing the other as the exit. With winds impacting laterally, I think it would minimize the movement and flex of the frame. Pitching foot or head onto the wind would likely flex the frame considerably and also swallow big gusts though the vents causing rippling and thus noise. The fabrics are light weight... the wind will move them, but the tent is solid, use it's strengths to your advantage and I can't imagine you would have a bad experience. The doors are too small / jamming zippers: Given the size of the tent, the doors could have been bigger... but I find them to be completely functional and easy to get in and out of. There are a couple of angles on the zippers where it is necessary to use both hands, one to grasp the tent, the other to zip. The fabric is so light that there just isn't enough weight to allow the zipper to pull without assistance. This is completely normal to me... I hardly have a zipper that doesn't require two hands to fully zip (my sleeping bag, backpack zippers, my fly for that matter), and as far as I'm concerned this is standard operating procedure. If there is weight immediately inside the door, weighting the tent down, the zipper is easier to use - not that I think they are difficult. I like the zippers; they are quality, quiet and secure. So, in summary, The Rattlesnake SL3 mtnGLO is a wonderful choice if you are looking for a packable palace for two! It's well designed, spacious and functional; like bringing a half a room out into the woods... In retrospect, The two person version of this tent, the SL2, would likely have been completely sufficient for our purposes, but the extra room in this tent makes it a real pleasure when your trip turns into a battle against nature. And while the lighting system was secondary to my purchase decision, it turns out it really is a nice feature to have aboard and makes the entire tent experience that much more homey and comfortable.
Date published: 2015-07-11
Rated 3 out of 5 by from Nice idea however falls short on design. I really wanted to keep this tent however there was one major flaw that I just couldn't cope with. The tent in itself is spacious and very lightweight. The pole design is very simple yet effective and the materials are top notch. Where it fall short is the fact that the door snags constantly unless you use two hands and carefully zip and unzip. The other annoying thing is the rainfly, same exact thing the storm flap on the zipper also snags. This was a major nuisance getting out of the tent at night having to fumble around with the zipper without it getting stuck. Overall if Big Agnes updated this issue this would be a phenomenal tent in my book.
Date published: 2017-06-05
Rated 5 out of 5 by from Works excellent-wife & I plus our 2 year old Just purchased a week ago for a week long trip on the Apostle islands. Wife & I plus our 2 year old lived in this the whole week. We remained dry & comfortable all week even in a 3+" rain storm. I would purchase this again. The sale price helped as well. The mtn glo feature was a plus for putting the little one to bed.
Date published: 2015-07-13
Rated 5 out of 5 by from Holy moley - the Taj Mahal of backpacking tents! I'm 6-foot-2 and 200 lbs-plus and my wife is 5-9, so we were evaluating roomier 2-person tents, "2-plus" models and 3-person tents, primarily for weekend backpacking trips in Colo. In particular, we very closely compared the REI Half Dome and Quarter Dome models (including REI Outlet close-outs) with the Big Agnes mtnGLO and other backpacking models, including the Rattlesnake, Tumble, Fly Creek, Slate and Ripple Creek. All of the newer models are relatively lightweight and easy enough to set up, but ultimately we chose the Rattlesnake SL 3 mtnGLO for several reasons, including its overall size and weight, packing size and - although we considered it to be gimmicky at first - the mtnGLO feature! The closest comparisons were the REI Quarter Dome T2 Plus and the Quarter Dome T3. The QD T2+ is a great-big 94" long, but is still only 54" wide, which is about the same as an average 2-person set-up. The QD T3, however - with only 4 ounces more weight - has a larger and much more flexible (in our opinion) footprint at 84 x 68, but only packs down to 8 x 25. The Rattlesnake SL 3 seemed to offer the best of both worlds, being even larger than the QD T3 (at equivalent weight), but also packed down to 7 x 21. It cost a little more ($50 delta retail, but only a $10 difference between on-sale prices) and has an amazing 47" of head room! We were able to set it and some of the other tents up right there in the REI store. (They're really good about allowing you to do that, so I highly encourage it during your tent-buying process.) I never gave any thought to door-size or zipper operation issues until I read some of the previous REI customer reviews. This is a 47-inch-tall, lightweight backpacking tent, so realistically, just how big do you need the doors to be? I have larger ones on my big, heavy 4-person "car-camping" tent, but who cares? The comments re: tent-wind direction orientation are spot on, but if you don't want any "rattling," then get a non-free-standing model or a mountaineering tent that weighs twice as much. As for "mtnGLO" - it really IS really pretty cool, so check it out!
Date published: 2015-07-28
Rated 5 out of 5 by from Best Agnes for price. Love the tent. The mtnGLO is an added feature that blows guests away. Light & and easy pack for backpacking. Durable zips, dual entrance, DAC poles, & great head high clearance. 2person seemed tight so I went with the 3person just in case. Overall, amazing tent. I will have this tent for a while!
Date published: 2015-12-28
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Does this come with a footprint?

Asked by: SWB
The Rattlesnake SL 3 footprint is sold separately:
Answered by: REIservice
Date published: 2017-05-20

The rear part of the tent (or foot of the tent), is it nylon or is it mesh all the way down to the bathtub floor? Cannot see inside the tent in the photo as door is zipped closed.

Asked by: Ranger 185
There is a small amount of nylon at the foot of the Rattlesnake SL 3. The nylon measures 7 inches in height from the ground. The nylon at the head of the tent measures 21.5 inches in height from the ground.
Answered by: REIservice
Date published: 2016-12-18

Would this be large enough to sleep two adults (5'11 and 5'1), a large standard poodle, and a bulldog? They don't have one of these in my local store, but I'm really tempted to purchase it online....

Asked by: Leah B
Floor dimensions of the Rattlesnake SL 3 mtnGLO Tent are 88 x 70 inches. A standard sleeping pad has a width of 20 inches. You can fit two standard sleeping pads in this tent lengthwise and still have 30 inches of room for your poodle and bulldog to get comfortable.
Answered by: REIservice
Date published: 2016-12-18

Are batteries required for the lights or are they glow material?

Asked by: Packer
Three AAA batteries produce the power.
Answered by: REIservice
Date published: 2017-06-08

What is the durability (Denier) of this tent's fabric?

Asked by: kd23
​The floor and walls are 40D while the rainfly is 30D. The mesh is 20D.
Answered by: REIservice
Date published: 2017-03-29

Is this tent double or single walled?

Asked by: EMaddox
The Rattlesnake SL 3 mtnGLO Tent is double walled. The images show the tent with and without the rainfly.
Answered by: REIservice
Date published: 2016-12-18
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