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OEX Leviathan EV 900 Sleeping Bag

Discount Card Price£119.00

Retail Price £240.00 Was £179.99Save 50%

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A four-season sleeping bag with hydrophobic down fill to keep you comfortable in hostile conditions.

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Product code: 15903112 / 321024

A four-season sleeping bag with hydrophobic down fill to keep you comfortable in hostile conditions.

The OEX Leviathan EV 900 is a lightweight and compact 4 season sleeping bag that will keep you warm in temperatures down to around -16°C.

The 900gsm / 600 Fill Power duck down in the Leviathan has a fluorocarbon-free hydrophobic coating, which helps it to retain loft when it gets damp, performing better than untreated down. It will retain a layer of warmth around your body more effectively, staying warmer to keep you more comfortable.

It comes with a compression stuff sack to help you optimise packing space - using the compression stuff bag, it will pack down to approximately 33cm x 27cm.

The Allied Down Feather in this sleeping bag meets the Responsible Down Standards (RDS). ETHICALLY PRODUCED. ENVIRONMENTALLY RESPONSIBLE. 100% SUSTAINABLE.

  • Tested to EN13537

Stuff Sack
49 x 60cm
4 Season
20D Nylon Shell and Lining
Draught Collar, Foot Box, Hood, Insulation, Compression Sack
220 x 78cm

This product qualifies for the following delivery methods

Standard Delivery (5-7 days) (FREE)


Standard Delivery takes 5-7 days. You will receive updates from the courier once your order is dispatched.

Premium Express Delivery (2 working days) (£6.95)


Premium Express delivery takes 2 working days, order by 4pm. Once despatched you will receive updates from the courier.

Reserve and Collect (within an hour) (FREE)


Reserve your items to collect in store - usually within 1 hour! We will notify you when your order is ready to collect.

Click and Collect (3-5 days) (FREE)


Order online and have your items delivered to a store. Orders take 3-5 days to arrive, you will be notified when your order is ready to collect.

AM Delivery (£7.95)


Order by 8pm and get your item delivered to you by 12pm the next working day (Not available for NI, Channel Islands or Highlands)

Bike Delivery (£4.95)


Bike delivery is £4.95. This applies to all bikes, and these orders are upgraded to a DHL courier service.

British Forces Post Office (BFPO) (FREE)


Forces ONLY and cannot be used for civilian or business deliveries

Delivery before 10:30am (£8.95)


Order by 8pm and get your item delivered to you by 10:30am the next working day (Not available for NI, Channel Islands or Highlands) Excludes Bank Holidays.

Saturday Delivery (order by 6pm Friday) (£5.95)


Next Day Delivery (order by 6pm Mon - Fri) (£2.95)


Delivered by UK Mail. Remote areas may take longer, please click here for more info.

Click and Collect Next Day (order by 6pm Mon - Fri) (£2.95)



Returning orders to us is easy. Whatever your reason, we offer a refund or exchange within 28 days of delivery or collection.

Ratings & Reviews

Overall Rating

4.64 out of 5
28 reviews
Write a review
4.64 out of 5

Not a 4 season

Tbh I had high hopes as it is advertised as a 4 season + , unfortunately it is not,
It is however a decent 3 season bag not only my thoughts,
Be aware you will be covered in feathers also your tent

4.64 out of 5

Updated review

Whilst this performed really well I made the mistake of washing and drying it(exactly as per the label) it's now about half the size. Like the rest of the OEX stuff I've used good but doesn't last

4.64 out of 5


Used the Leviathan whilst in the Lakes ,temp dropped below zero,had a brilliant nights sleep .I'm six foot ,plenty room ,nice features .For the price ,bargain.

4.64 out of 5

Happy with this

Used this last night in the lakes, minus 3 and I was toasty. Early days granted but so far just fantastic. Can't believe it squeezes down to the size of a loaf of bread.

4.64 out of 5

Good bag but leaks feathers

I used this sleeping bag wild camping in Wales and although it kept me nice and warm I was covered with feathers the next morning. I will be using a sleeping bag liner with it from now on

4.64 out of 5

Good quality, Bargain price.

I love this bag. It is very well made and so far ive used it a few times with no feather leakage and no cold spots. It plumps up really nicely and is very warm.You wont get better for the price.

4.64 out of 5

Kept us warm on Kilimanjaro

I did use a liner for extra warmth on the mountain as feel the cold but otherwise great sleeping bag, good inside zip to keep phone warm and draw strings get you nice and snug. Condensed well in the compression bag. Great price also.

4.64 out of 5

Good overall .

I've used rab or mountain equipment bags for 30 years and was in need of a 4 season one to replace my aging rab. The price of this oex bag was very good so I took a punt. Ive used it this November in Scotland where temperatures just dipped below freezing and it was fine, just about. Positives first. This bag feels luxurious and lofts well. Nothing like looking forward to sleeping in a comfortable bag after a long hard day. Its a good size. I'm 6 ft and had plenty of space. The two draw cords work well and stay in place once pulled. Now the negatives. I am a cold sleeper and was on the cusp of being slightly uncomfortable on a couple of occasions. -16. No chance. Also the zip often snagged which was frustrating when trying to get back inside quickly after a toilet visit. I don't think it is quite as good as a 4 season rab back, but factor in the price and it's a bit of a bargain.

4.64 out of 5

Excellent sleeping bag

This is an excellent sleeping bag. It is comfortable and very warm. I am always cold yet this bag kept me toasty warm on my recent trip to Stok Kangri, I camped at 5000m and was very warm every night with no additional liner needed. It comes with a small stuff bag and a large mesh storage bag. The sleeping bag is a good size with plenty of room. Highly recommended.

4.64 out of 5

The best

All of my years of camping I had borrowed other sleeping bags and just used my own liner, but I was camping near a go outdoor store and was cold the night before I headed into the shop and saw this. I had always wanted a down bag but they had always been to expensive but this one isn’t too badly priced and is the best sleeping bag I’ve ever slept in the anti snag zip is perfect as I often got the zip caught on previous bags. But the warmth is extremely good. Many thanks to the guy who recommended it

4.64 out of 5

Awesome bag

Seriously good bag ! . makes every Friday come even quicker and too get out in the sticks .

4.64 out of 5

Oex leviathan. Top marks all round.

Top marks all round

Excellent. Ordered this sleeping bag online and was delivered on time.

Top quality bag and when you compare it to other down sleeping bags of similar spec and then compare the price its not only a quality product your buying but saving on money too.

You get a storage sack to keep the bag in when not in use so as can be stored without having the bag compressed over long periods of time.

There really isn't anything negative i can say for this product so far. Much better quality than i thought it would be once receiving the bag. Really good quality materials used very soft and comfortable and i really like the design of the bag and the colour of black and lime.

Overall a very warm four season bag of excellent quality which will be my main winter bag now. Very happy with this product.


4.64 out of 5

Very impressive; mostly

Fairly new to wild camping but needed a serious sleeping bag upgrade - this fitted the bill nicely. It's definitely very warm indeed and comfortable too. It lofts easily and packs down well. Only small issues are a slightly odd smell (no it isn't me!) probably from the down and the utterly useless compression sack - my £30 one has a far better one; pack it out of a compression sack around your other items. Other than that, top notch. Might compliment it with a Helios soon too.

4.64 out of 5


amazing sleeping bag, packs down tiny, nice and warm when used in temps above 0 degrees, however if you were to go lower it may be a bit cold. i would buy again!

4.64 out of 5

Oex sleeping bag

This is definitely a top quality sleeping bag that won't be beaten price wise. Unfortunately I'm 6.2 and it only comes to my shoulders. I measured this sleeping bag and find it to be 210cm to the top of the hood. If your 6ft tall or over you might find it to be too short. Unfortunately I had to return this which is a shame really. Packs small as well.

4.64 out of 5

Cracking bag.

I bought this bag on the back of a review. I'm glad I did! Used it on a winter camp on Dartmoor where the temp dropped well below freezing. It kept me warm and cosy. Compresses down to a small size.
My only small gripe would be about the zip baffle, you have to careful not to catch it in the zip. Other than that it's a cracking bag for the money.

4.64 out of 5

Awesome bag

Just used this bag in Scotland last week in temperatures down to around -8. Very warm,even had to vent most nights! incredible bag for the price.

4.64 out of 5

Great down bag

I used this recently on a sub zero trip to Dartmoor and found it extremely warm and not too claustophobic as same bags can be when cinched up. Condensation in my tent was quite heavy on the first night followed by a failed tape on the tent which results in the bag becoming damp on the outer shell. Despite this the hydrophobic down retained its left and warmth. One dlight niggle was the factory that it was easy to catch the baffle when zipping up but nothing more than a minor point in ky view. Overall very happy indeed!!!

4.64 out of 5

Fully tried and tested

Just back from a two week trek in Nepal and this sleeping bag kept me warm even when we had to camp in -10C . Really snug and cosy I actually slept better than I do at home

4.64 out of 5

OEX Leviathan EV 900 Sleeping Bag

Very excited to receive my OEX Leviathan EV 900 Sleeping Bag. I did a lot of shopping around for my trip to Everest Base Camp and found this little beauty. It's so warm and comfy. The compression bag is a real space saver. Great value for money and plenty of length too. The Decathlon version charges extra for the additional height! Great customer service and speedy delivery.


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