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Sea to Summit

Trek TkIII Sleeping Bag (-11°)

From $339.90
5.0 4
or make 3 easy payments of $113.30
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The warmest bag in the Sea to Summit Trek range of sleeping bags, the Tk3 is a bag for those with a wider frame not wanting to resort to a more restrictive mummy shaped bag. Packing down to 5L, it’ll fit neatly in the bottom of most trekking packs.  

The bag incorporates highly-breathable 2D PermaShell™ fabric which will keep your down in tip top shape. The tapered rectangle design makes the Trek ideal for people with a larger frame or slickers for space. The full length side and foot zips mean you can zip it wide open and use it as a quilt, for those warm nights or if you have company. A two-dimensional hood is useful for trapping extra warmth on those colder nights.

An oversize internal pocket is big enough to keep your wallet, passport, and iGadget. The lightweight Ultra-Sil® compression bag compresses the bag down to a mere 7L. The Trek Tk1 is a bag for the trekker wanting a freer night sleep, but with the warmth to get them through a cold night in the hut.

  • Comfort rating -1⁰c
  • 650+ loft 85/15 premium duck down
  • Breathable 2D PermaShell™ fabric
  • Tapered rectangular design
  • Oversized internal zippered pocket
  • Lightweight Ultra-Sil® compression bag, mesh storage cell and laundry bag included
Snowys Code:
Supplier Code:
Comfort Temp. Rating:
-5 °C
Lower Temp. Limit:
-11 °C
Compressed Volume:
7.05 L
Max. User Height:
170 cm
Internal Girth:
148 cm Chest |146 cm Hip |98 cm Foot
External Dimensions:
170L x 74W x 5H cm
Packed Dimensions:
37L x 21W x 20.5H cm
33D Nylon with DWR 342T
Fill Material:
650+ Loft 85/15 Premium Duck Down
Fill Weight:
700 g
Zip Draft Tube:
Double YKK #5
40D Nylon 310T
1.215 Kg
Suggested Use:
Camping | Hiking
Limited Lifetime
5.0 4
5 stars
4 stars
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2 stars
1 star
Jan 14 2017

Great bag

Prompt service, fast delivery.
Great bag ( I am 183cm) very warm and comfortable.

- Adelaide
Oct 05 2016

Quality Aussie bag

So happy I spent a little extra and purchased the warmer tklll, Even when the temp reached around 7 degrees Celsius I simply opened up the bottom and it was comfortable. The width/length is great for my wide build 6'2 body. Packs easily away into a small size.

- Perth
May 27 2016

Great product

Purchase and delivery was excellent. We bought two of these sleeping bags. First night of using them it was at 1300 metres in Victorian High Country, A cold wet stormy night and we were warm and slept well. Highly recommend the product.

Jun 25 2015


This sleeping bag has very high quality in every area. Nothing to complain. It's just perfect for me in winter. The price at Snowy is the best I found in Aust. The delivery was faster than I expected. It's like someone done the shopping for you and delivered to your door in a flash. I am fully satisfied. It's excellent experience to shop at Snowys.


temperature trek III1 answers

Is the sleeping bag Trek III still comfortable to be used in the summer at 15 ° C

- -(3 months ago)

G’day Stijn,

The Seat to Summit Trek TkIII is the warmest in their Trek range and it has a comfort rating of -5 degrees so it is designed for Autumn/Winter weather.

I would say that if you’re cold at home on a 15° night, then chances are you’d want a bag that was on the warmer side like the TkIII. If you’re a hot sleeper you might want to consider the TkII as that has a -1 ° rating.

As far as we know there aren’t any bags that are designed to be used in Summer and Winter, but in general it’s better to be a little too warm and unzip your bag, then be too cold and not be able to do anything about it when you’re out in the elements.

- Snowys(3 months ago)

Would this bag be suitable for a smaller framed man? 1 answers

This range talks about being suited for larger framed men but im wondering whether it would be suitable for someone smaller such as myself? I like the idea of a little more room but would too much heat be wasted? Id be using it in places where the temperature would never drop below -5°C. Thanks.

- BURNIE, TAS(7 months ago)
When we refer to space for a wider frame, we are really comparing it to the mummy shaped bags which are very restrictive. If you are not a particularly cold sleeper, then this bag will be suitable for you. It has suitable drawstrings in place so you can wrap yourself up in the bag and trap all the warm air, and it provides versatility in its temperature range across warm and cold temperatures. Furthermore, by adding a thermal liner you can make the bag even warmer for mid winter expeditions.
- Snowys(7 months ago)

sea to summit trek111 bag1 answers

Under details it states the comfort rating is -1. Is it -1 or -11?

- BENTLEIGH EAST, VIC(7 months ago)
Hi Kim, this sleeping bag has a comfort rating of -5 and a lower limit of -11. Sorry for the confusion, I'll get the fixed in the product description.
- Snowys(7 months ago)

Trek II or Trek III?1 answers

I'm deciding between the Trek 2 and 3. Trek 3 is about 200g more than Trek 2. Would that make much of a difference when hiking in terms of space and weight overall? Also, I'd like to use it for camping out in country and/or alpine areas during June and July, would the Trek 2 still be sufficient for the colder nights or will the Trek 3 be a better option if temperatures are freezing or below?

- St Kilda(10 months ago)
The difference in packed size between the two will be negligible Hannah, and it really depends on how you look at the 200 g of extra weight. There is no point in getting a cooler bag and end up throwing 200+ grams of extra clothing in to compensate, you might as well get the benefit of lightweight down in the warmer option. I would recommend the Trek 3 for alpine use also. These have a relaxed shape and will not be as efficient as a mummy bag such as the Talus, so more down is better. This shape has its benefits in warmer climates though... there is always a trade off.
- Snowys(10 months ago)

Delivery to

Pick up from Snowys

92 Richmond Rd, Keswick SA

Opening hours:
Mon - Fri: 9am - 5.30pm
Saturday: 9am - 5pm
Sunday: 12pm - 5pm
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