Sea to Summit Trek Tk1 Sleeping Bag
Features & how to use
Details & Specs
Are you a bit…broader in the shoulder? Or, like George Costanza, you don’t like to be too constricted when you sleep. “I like to be able to take the blankets and swish them and swirl them.” The Sea to Summit Trek Tk1 is the sleeping bag for the traveller that likes a bit of extra room.
The Trek Tk1 has a tapered rectangular design which provides extra room compared to a mummy style bag. To keep the weight down and ensure that it’s compressible, the shell is made from durable 30D nylon, with a soft and breathable 20D nylon lining. To keep you warm, the Tk1 is filled with RDS certified 650+ Loft ULTRA-DRY Down which provides superior lightweight insulation.
To prevent the zip getting caught, there’s an oversized zipper draft tube and this bag has vertical chest baffles help stop cold spots and down migration. When the temperature rises, open up the full-length two-way side zip and separate foot zip and use it as a quilt. If it’s a chilly night, you can just zip it up and draw in the 3D hood to trap extra warmth.
You can also keep track of essentials such as your phone or headtorch by storing them in the internal security pocket. Be comfortable and get a great night’s sleep on your adventures around the globe with the versatile and classic Trek Tk1 Sleeping Bag from Sea to Summit.
5°C comfort rating, -1°C lower limit
20D soft touch light and breathable lining
RDS certified 650+ Loft ULTRA-DRY Down for insulation and compressibility
3D hood draws in tight when needed
Lightweight fabrics for reduced weight and bulk
Vertical chest baffles prevent down migration and cold spots
Two-way side and separate foot zip allow for use as a quilt
Large internal security pocket
Includes storage cell and compression bag
LH and RH bags zip together
Snowys Comfort Rating:
Fill Ratio Top/Bottom:
Max. User Height:
152 cm Chest | 146 cm Hip | 102 cm Foot
193L x 69W cm
39L x 17.5W cm
10L | Compression Sack Size S
RDS 650+ Loft ULTRA−DRY Down™
Zip Draft Tube:
#5 YKK | Left 2 Way Side | Foot Zip | Zip Coupling Compatible
I'm 180cm tall, will the regular size be comfortable or should I upsize to the long?
Sam - Bendigo South, VIC (1 year ago)
The user height of this bag is 183cm, and you're under that - so no issues with the regular. If you want more info, check out the 4:42 mark in our product video - Bens in the bag and he's 185cm. Hope the helps.
Lauren - Snowys(1 year ago)
Tk3, tk2 and Tk11 answer
Hi Are all the S2S trek series bags compatible, that is can you zip together a tk3 and a tk2 Thanks Mark
Mark - Brisbane, QLD(1 year ago)
No, they're not unfortunately, the zip coupling system only works between S2S unisex and womens specific bags. Eg, the Trek zips to the Journey series. This is due to the zip orientations being different on each bag. The unisex bags have a left oriented zip, the womens specific have a right oriented zip.
Lauren - Snowys(1 year ago)
How would you compare this bag to the s2s treeline 1 answer
Which is warmer?
Joel - Parkdale(3 years ago)
The Treeline is Sea to Summits entrance level down sleeping bag. It just has a side zipper, RDS 600 Down, and a standard storage sack. The Trek TK1 has a side and foot zipper, so you can open it out as a quilt. They have RDS 650 Loft ULTRA-DRY Down™, and a compression sack. Overall both options are good, with the Trek Tk1 having a slightly higher comfort rating, and lower weight.
Leece - Snowys(3 years ago)
Two bag connection1 answer
If I want to connect two bag do I need one left side zipper and one right side zipper? If so do you sell the right side zipper?
Tim - 3000(4 years ago)
The Trek TK1 Sleeping Bag can't be zipped to another Trek sleeping bag but can be zipped to any of the Sea to Summit Women's bags that are zip coupling compatible. The Journey Jo1 has a right side zipper is considered the counterpart for the Trek TK1 and Tk2, which have left side zippers.
Leece - Snowys(4 years ago)
Foot zipper1 answer
Does this sleeping bag open all the way open around the feet?
Amanda - Morpeth(4 years ago)
Yep! The Trek Tk1 foot zip opens all the way around so you can open the bag up completely, like a quilt cover. Check out the video on the product page for clarification on the features.