Looking for a lightweight three-season tent that feels more like a comfortable basecamp than a claustrophobic cocoon? Here’s what we made of Big Agnes’s sustainable, supremely liveable Crag Lake SL3.

The Big Agnes Crag Lake 3

Ideal for: Three-season backpacking and wildcamping

Not suitable for: Fastpacking, deep winter wildcamping

The Big Agnes Crag Lake SL3 is a freestanding, three-season tent marketed as a three-person shelter — but in our view, it’s best used as a spacious, well-ventilated, and easy-to-pitch option for two. Weighing in at just 2.225 kg with a packed size of 6 x 19.5 inches, it’s light enough for multi-day backpacking and versatile enough for most UK weather, provided you avoid the truly wild stuff. With two big doors, symmetrical vestibules, ample head height and top-notch eco materials, it’s a proper liveable home-from-home. RRP is around £399 (though is currently on sale for £340 at LD Mountain Centre) — and for what you get, we reckon that’s fair.

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Big Agnes Crag Lake SL3 tent review

Big Agnes, based out of Steamboat Springs, Colorado, has built a serious name for itself in ultralight gear circles. Known for blending thoughtful design with eco-conscious construction, they’ve earned fans across the pond for kit that genuinely performs. The brand’s focus on sustainability has been a growing part of their story in recent years — and this is reflected clearly in the Big Agnes Crag Lake SL3, which features recycled fabrics and a PFAS-free water-repellent finish.

Marketed as a three-person, three-season tent, the Big Agnes Crag Lake SL3 is a freestanding dome that leans heavily into comfort and convenience. It’s pitched (literally) at lightweight backpackers and wild campers who still want space to sit up, sprawl out, and stash gear properly. At 2.225 kg and with a pack size of 6 x 19.5 inches, it lands in that sweet spot between packability and liveability. It’s currently on sale at LD Mountain Centre for £340 (RRP £399.99), which — for a shelter with this much space and usability — feels fair, especially considering the eco creds.

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So where does it sit in the market? It’s more affordable than the NEMO Dagger Osmo 3P (£580) and MSR Elixir 3 (£374), and just a whisker above the REI Half Dome SL 3+ (£300). It’s also a step up in comfort and livability from the North Face Trail Lite 2 (£260), which — while decent for short, fair-weather trips — feels more basic in both features and space. While the NEMO Dagger Osmo 3P is lighter, the REI Half Dome SL 3+ is bigger inside, and the North Face Trail Lite 2 is cheaper, the Crag Lake SL3 finds a lovely middle ground: it’s durable, surprisingly roomy (for two), and offers enough comfort that we found ourselves looking forward to getting back inside it at the end of a long hill day.

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How we tested the Big Agnes Crag Lake 3

Both wild camps were in Snowdonia at height, which meant cooler evenings, the ever-present risk of a downpour, and that classic Welsh unpredictability. While the weather didn’t fully test the Crag Lake SL3 in terms of wind or sustained rainfall, it still had to contend with cold nights, damp ground and fluctuating conditions — and to its credit, it handled the lot without fuss.

On both trips, the tent pitched quickly and cleanly, even after long days on the hill. Once set up, it stayed rock steady through a night of shifting breezes and dropping temperatures. There was no excessive flapping from the flysheet, no creaking from the poles, and no mid-night wake-ups caused by wind-blown noise — always a win when you’re wild camping above the treeline.

The ventilation system came into its own here. With that full mesh inner and the large rear prop vent in action, we didn’t experience a single case of condensation. Not a drop. And that’s not something we say lightly when reviewing tents in Snowdonia. It speaks to how well the Crag Lake SL3 manages airflow, even in still, humid air where most tents would fog up inside.

We didn’t face any driving rain, so we can’t speak to its full storm-worthiness, but we did check the materials and construction thoroughly. The flysheet has factory-taped seams and a PFAS-free water-resistant coating, and it all felt reassuringly robust despite the tent’s relatively low weight. We’ve no doubt it would handle a decent bit of rain — just maybe not a sideways sleet barrage on an exposed Scottish ridge.

That said, for spring through early autumn in the UK, especially if you’re picking your pitch wisely and avoiding the worst of the weather, the Crag Lake SL3 feels very capable. It’s a tent that rewards good decision-making with a comfortable, breathable and genuinely enjoyable place to spend the night. And in the British hills, that’s exactly what you want.

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Walking through the Crag Lake SL3: features we loved (and a few we didn’t)

Step inside the Crag Lake SL3 and you immediately get a sense of how well thought-out this tent is. At 2.225 kg, it’s not the lightest three-person shelter on the market — but it’s nowhere near the heaviest either. For the level of comfort, space and organisation on offer, we think it hits a really solid sweet spot for UK wild camping and backpacking. Especially if you’re planning to share the load between two.

Pitching & livability

Pitching it is refreshingly simple. There’s a single poleset with a swivel hub and pre-bent poles — all colour-coded to keep things obvious when you’re tired, cold, or losing the light. Two white ends, two lime green, and matching tabs on the inner make setup feel intuitive and quick. On both trips we had it up in minutes. It’s an inner-pitch-first design, so not ideal in driving rain — but in fair weather or with a bit of shelter, it’s an easy one to get along with.

Once pitched, the Crag Lake SL3 really comes into its own. The dome shape means you get a usable internal height of 112 cm — enough for both of us (5’9”–5’10”) to sit up, change clothes and sort gear without feeling hunched. It’s a proper live-in tent, not just a lie-down-and-sleep one. The full mesh inner keeps things breezy, and the big rear vent works well to move air through. Over both nights we wild camped, we didn’t get a single drop of condensation — something that rarely happens in Snowdonia, even in decent conditions.

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We were also impressed by the storage. You get two oversized ceiling pockets at each end, plus two corner stash points. That gave us more than enough room for all the usual suspects — torches, phones, spare layers — and meant we weren’t constantly rummaging around. There are four internal loops sewn in too, which is handy if you want to hang a lantern or run a line for drying damp kit. Little touches like this are often overlooked, but they make a big difference when you’re living out of your shelter for days at a time.

The two massive doors deserve a mention of their own. They open right up, which makes getting in and out a breeze — no clambering over your mate’s sleeping bag when nature calls at 3 a.m. They also make the whole tent feel more open and airy, especially when paired with the symmetrical vestibules. These porches are decently sized, with loads of space for boots, rucksacks and cooking gear. On our second night, we easily cooked dinner outside one side while the other vestibule kept our packs and boots dry.

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Durability

And while we didn’t face rain on either trip (a miracle in itself), the tent’s build quality gave us confidence. The fabrics are recycled and PFAS-free, but still feel tough and tightly woven. Factory-taped seams suggest it’ll stand up well to a proper downpour, and we gave everything a once-over just in case — it all passed the eye test.

Now, let’s talk capacity. Officially, this is a three-person tent. But unless you’re using three mummy mats and arranging them with military precision, we think it’s much better for two. We tried fitting two full rectangular mats side-by-side and simply couldn’t squeeze in a third. With three mummy mats you could make it work — one across the middle — but it’s tight. As a comfortable two-person setup, though? The Crag Lake SL3 is brilliant. Spacious, airy, and well-designed for gear storage and access. Just don’t expect it to feel roomy if you’re bringing a trio.

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How it held up in UK conditions

Both wild camps were in Snowdonia at height, which meant cooler evenings and changeable skies. While we didn’t get hammered with wind or soaked through by rain, the Crag Lake SL3 handled everything we threw at it with ease. It stayed solid, never flapped excessively, and the ventilation was spot on. For a tent this light and lofty, we reckon it’s best suited for mild-to-moderate conditions — we’d hesitate to take it into properly exposed areas during storms, but for spring through early autumn use in the UK, it’s a very capable shelter.

Big Agnes Crag Lake SL3 tent FAQs

Really well. The full mesh inner and rear prop vent mean airflow is excellent, even on muggy nights. You can roll back the fly for stargazing or just to let the breeze in, and we never had condensation issues on either of our summer wild camps with the Crag Lake SL3.
This isn’t a winter tent. The Crag Lake SL3 is a three-season shelter and performs best in mild to moderate conditions. It lacks the insulation and stormproofing you’d want in deep winter or alpine conditions. For UK winters, we’d go for something more robust and with less mesh.
We only had light breezes during our tests, but the dome shape and freestanding design of the Crag Lake SL3 suggest it’ll cope with moderate winds just fine. It wouldn’t be our first choice for fully exposed mountain ridges in storm conditions, though — stick to sheltered spots.
Very easy. The colour-coded pole system on the Crag Lake SL3 makes it intuitive, and it pitches fast. We had it up in minutes on our first go. The only slight downside is that it pitches inner-first, so you’ll want to be quick if the rain rolls in.
Yes — if you’re using it for two people. At around £340 (currently on sale at LD Mountain Centre), you’re getting a well-built, sustainable tent with thoughtful features and loads of comfort. It’s not the lightest, but it balances weight, space and usability very well. Just don’t expect it to sleep three in comfort.

So — is it worth it? Our verdict of the Big Agnes Crag Lake 3

If you’re looking for a comfortable, sustainable, and easy-to-use tent for two people, the Big Agnes Crag Lake SL3 is a brilliant bit of kit. It’s not ultralight, but it’s light enough. It’s not bombproof, but it’s tough enough. And it’s definitely not a three-person tent — but for two? You’ll sleep well, sit up straight, and actually enjoy being inside it. At around £340 (currently on sale at LD Mountain Centre), we think it’s great value — especially considering the quality of the materials, the thoughtful design and the easy setup.

We loved it. But we also think Big Agnes should rename it the Crag Lake SL2.5.

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