Designs from a life on the road

Trek 3 Sleeping Bag

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Over the  years I've been using a Trek 3, Sea to Summit sleeping bag and think it represents great performance at a reasonable cost. Excellent just got better.

It's not a cheap sleeping bag....but that's the point!
Sea to Summit started as a sleeping bag company and have many years of experience to draw on.

Please note - we have a mix 2018 and 2019 stock. Our large size bags are 2018, hence the price differences.
2019 bags are blue.
Here is what they say about their Trek 3 series.

The classic tapered rectangular sleeping bag - redefined!
Incorporating our 2D PermaShell™ DWR (durable water repellent)fabric and a premium 650 loft down, the Trek bags are a refined classic. The 60/40 fill ratio in the Trek bags is maintained using a side block baffle and differential cut shell. In the top of the shell a 3D side wall, a feature normally reserved for technical alpine sleeping bags, provides more space for the down to loft right to the edge of the bag.
Permashell is a high-density weave, 30 denier Nylon that is down-proof by construction – it does not need a coating, like some lower-quality shell fabrics. A DWR finish helps to shed moisture. The material is highly breathable to allow body moisture vapor to escape for a cozy, comfortable sleeping environment

An oversized security pocket located inside the bag is easily accessible, ideal for stashing passports and other valuables while travelling. The soft touch lining fabric is down proof (you won't get out of it looking like a snow ...person...) by construction and highly breathable offering a comfortable sleep.

Features a full length side and foot zip allow it to be opened out into a full doona for use indoors and warm weather.

What really impresses me about this bag is the attention to detail. The a storage bag for home and compression storage bag for the road. We are encouraged to register our bag with Sea to Summit for example. The zippers actually work from inside and outside the bag and don't snag due to the clever stiffened baffle system. The Hood drawstring works two way, closes at the head and/or the chin.

I understand that you don't spend close to 400 bucks on a sleeping bag very often and want to be sure you are getting an excellent item. That is why I have put time into checking it out. This is the best sleeping bag I have ever owned!

Length / zip options:
  • Regular - left or right zip - for people to 185cm/ 6ft
Season ratings:
  • Spring/Autumn/Winter-lite (fine in almost all Aussie winter conditions)
Trek 3 come in Short as well.  Please email me for availability.


Tapered rectangular- The tapered rectangular design offers a good compromise between the comfort of a generous cut shape and warmth of a closer fit. The tapered rectangular design offers a good compromise between the comfort of a generous cut shape and wa
2D PermaShell™ DWR shell fabric, differential cut shell with 3D side walls
60/40 down fill ratio, 650 Loft 85/15 Premium Duck Down, Fill weight: Short 700 g/25 oz | Regular 700 g/25 oz | Long 750 g/26 oz
Side block baffle, zip draft tube with anti-snag, cushioned internal hood drawcord with dual adjustment,
2 x 2 way YKK #5 non snag zips, side and foot separate zip, opens to doona. Large sized internal security zip pocket
Other stuff to know
Includes lightweight Ultra-Sil® compression bag 15 litre down to 7.8, mesh storage cell
Bag weight: Regular 1220 g/2 lb 11 oz | Long 1310 g/2 lb 14 oz
-5, Lower Limit -11, Extreme survival -30

User Reviews

  • Warm as

    I bought this bag in the Long version for a trip to the Flinders Ranges and up the track to Oodnadatta. It's warm, comfortable, light and packs down great. The no snag zipper is great compared to other bags I've used. We had a night in Farina that was about -5 and I was warm all night despite getting up to a good layer of ice on my swag. I believe this is well priced for a light, small and warm bag that's great for bike touring, you just can't beat being warm and getting a good nights sleep. It can be opened up to use like a doona if the temp is higher so pretty versatile but I've not had to use it above about 4 degrees so far. I'm really happy I bought it and expect I'll get years and years out of it based on the quality. 5 stars

    9 months ago

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