Sea to Summit Trailhead THIII Sleeping Bag Long
Sea to Summit Trailhead ThIII is a very warm synthetic sleeping bag, designed for camping and multi-day trekking! Trailhead is full of technical features, while maintaining a simple design. Its tapered rectangular shape offers you more space and comfort than a traditional mummy and thanks to the integral side zip and the one on the feet you can open it completely and use it as a quilt. By adjusting the opening and closing of the zip you can also manage the heat and external ventilation, finding the temperature that's right for you! In addition, the hinges are designed to avoid getting caught while you open and close them. A nice advantage that avoids hitches when you just want to rest! Sea to Summit uses the WaveLoft construction for this sleeping bag, which by using thick layers of insulation wrapped together allows to obtain a greater thickness and trap pockets of hot air, thus ensuring greater heat when it is colder.The compression bag is included in the package.
Sea to Summit Trailhead ThIII is a very warm synthetic sleeping bag, designed for camping and multi-day trekking! Trailhead is full of technical features, while maintaining a simple design. Its tapered rectangular shape offers you more space and comfort than a traditional mummy and thanks to the integral side zip and the one on the feet you can open it completely and use it as a quilt. By adjusting the opening and closing of the zip you can also manage the heat and external ventilation, finding the temperature that's right for you! In addition, the hinges are designed to avoid getting caught while you open and close them. A nice advantage that avoids hitches when you just want to rest! Sea to Summit uses the WaveLoft construction for this sleeping bag, which by using thick layers of insulation wrapped together allows to obtain a greater thickness and trap pockets of hot air, thus ensuring greater heat when it is colder.The compression bag is included in the package.
Sea to Summit Trailhead ThIII is a very warm synthetic sleeping bag, designed for camping and multi-day trekking! Trailhead is full of technical features, while maintaining a simple design. Its tapered rectangular shape offers you more space and comfort than a traditional mummy and thanks to the integral side zip and the one on the feet you can open it completely and use it as a quilt. By adjusting the opening and closing of the zip you can also manage the heat and external ventilation, finding the temperature that's right for you! In addition, the hinges are designed to avoid getting caught while you open and close them. A nice advantage that avoids hitches when you just want to rest! Sea to Summit uses the WaveLoft construction for this sleeping bag, which by using thick layers of insulation wrapped together allows to obtain a greater thickness and trap pockets of hot air, thus ensuring greater heat when it is colder.The compression bag is included in the package.
Sea to Summit Trailhead ThIII is a very warm synthetic sleeping bag, designed for camping and multi-day trekking! Trailhead is full of technical features, while maintaining a simple design. Its tapered rectangular shape offers you more space and comfort than a traditional mummy and thanks to the integral side zip and the one on the feet you can open it completely and use it as a quilt. By adjusting the opening and closing of the zip you can also manage the heat and external ventilation, finding the temperature that's right for you! In addition, the hinges are designed to avoid getting caught while you open and close them. A nice advantage that avoids hitches when you just want to rest! Sea to Summit uses the WaveLoft construction for this sleeping bag, which by using thick layers of insulation wrapped together allows to obtain a greater thickness and trap pockets of hot air, thus ensuring greater heat when it is colder.The compression bag is included in the package.
in 3 offers
The lowest price for Sea to Summit Trailhead THIII Sleeping Bag Long right now is $214.99 at Techinn.com, compared across 3 retailers.
The all-time low was $214.99 on 23 June 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 23 June 2026.
Last updated at 23/06/2026 10:25:12
Sea To Summit Trailhead Thiii Sleeping Bag Blue Regular / Left Zipper Men
Delivery $48.99
Trailhead ThII/ThIII Sea To Summit Sleeping Bag
Delivery between Thu – Sat $4.91
Sea to Summit Trailhead Synthetic Sleeping Bag ThIII - Clearance Long
Free delivery
originally posted on seatosummitusa.com
I bought this bag to replace my 20 year old bag which was rated at 20 degrees and served me well. The trailhead is significantly lighter, quality made, the zipper setup allows for good ventilation and packs well.
originally posted on seatosummitusa.com
I've had many sleeping bags in 50 years of Scouting and this one was fabulous. It was light, compressable and very warm. Zipper was flawless. I paired it with a Reactor liner to provide comfort to even lower temperatures.
originally posted on seatosummitusa.com
This is a bulky bag. I would reserve it for car camping/base camping. It’s too much to Cary. For the price there might be better options but it is certainly a very well made bag.
| Snowys Comfort Rating | −1 °C |
| Lower Limit | −7 °C |
| Shape | Tapered Rectangle |
| Max. User Height | 183 cm |
| Internal Girth | 152 cm Chest | 146 cm Hip | 102 cm Foot |
Sea To Summit Trailhead Thiii Sleeping Bag Blue Regular / Left Zipper Men
Delivery $48.99
Trailhead ThII/ThIII Sea To Summit Sleeping Bag
Delivery between Thu – Sat $4.91
Sea to Summit Trailhead Synthetic Sleeping Bag ThIII - Clearance Long
Free delivery
I bought this bag to replace my 20 year old bag which was rated at 20 degrees and served me well. The trailhead is significantly lighter, quality made, the zipper setup allows for good ventilation and packs well.
I've had many sleeping bags in 50 years of Scouting and this one was fabulous. It was light, compressable and very warm. Zipper was flawless. I paired it with a Reactor liner to provide comfort to even lower temperatures.
This is a bulky bag. I would reserve it for car camping/base camping. It’s too much to Cary. For the price there might be better options but it is certainly a very well made bag.
Everyone needs a warm, synthetic bag to save your good down bag. I use it for winter car camping on the South Coast NSW, which can get sub-zero. It's a comfortable bag with an excellent feature: the material on either side of the zip is stiffened so that fabric never gets caught. Easy to open and close during the night.
I'm not a hardcore backpack adventurer or anything, but I do love motorcycle camping, so I was looking for a low pack-volume sleeping bag that wasn't outrageously expensive. I'm also 6'1", 210 lbs. so I needed something roomy enough for me to be comfortable.This bag is super comfortable. It's soft and warm and packs down nice and small for stowing in my bike's luggage. I don't know why the reviewer Adam from Germany said it was impossible to get it back into the stuff sack, because I find it to be quite easy to get it back into the sack. It literally takes me about 60 seconds to roll the bag up and stuff it in the sack.I will say that if the temps drop into the 40s or lower, you're going to need a bit more than this bag can offer, so I'm going to get the liner to ... MoreI'm not a hardcore backpack adventurer or anything, but I do love motorcycle camping, so I was looking for a low pack-volume sleeping bag that wasn't outrageously expensive. I'm also 6'1", 210 lbs. so I needed something roomy enough for me to be comfortable.This bag is super comfortable. It's soft and warm and packs down nice and small for stowing in my bike's luggage. I don't know why the reviewer Adam from Germany said it was impossible to get it back into the stuff sack, because I find it to be quite easy to get it back into the sack. It literally takes me about 60 seconds to roll the bag up and stuff it in the sack.I will say that if the temps drop into the 40s or lower, you're going to need a bit more than this bag can offer, so I'm going to get the liner to add that 10-15 degrees in case it gets a little chillier when I'm camping. But down into the 50s (Fahrenheit), with socks and sweats, I was toasty and slept great.
I like the feel of this bag, and the construction seems nice. Unlike another reviewer, I did not find it impossible to put back in the "stuff sack." I was, however, expecting it to pack down more. I'm not sure what size that water bottle is in the photo, but it must be some extra large version compared to the standard camelback. That, or someone miss measured with their photoshop. There is no way to compress this sack, and it is 17 in by 9.25 in. Quite a bit larger than I was expecting. Unfortunate for me, as the pack size is important. I hope it is worth it!
Warm enough in mid -thirties, wearing wool clothes to bed, in tent in cool wet weather.Would not trust it below freezing (it's rated to 20F) Light and compact enough for the bottom of pack compartment. Sufficed for an early fall trip to the Boundary Waters.
Purchased this for Adventure Motorcycling, fits inside a Kriega OS 32 with ease and works well, I got the long and i'm 6-3" and around 130kg and can just get inside the bag and mated to the air mattress you will get a nice sleep. a little restrictive but you get used to it after a night or two. I run a liner in as well to keep bag clean and aid with a few extra Deg. My only gripe is i wished i purchased earlier instead of mucking around with various cheap sleep bags.
My husband absolutely loves it. He has tried it out a couple of times now. The next big test will be his trip down to the Snowy Mountains first week in October. He is very impressed.
Warm as rated, decent zippers. Roomy enough to be comfortable, but without carrying extra weight. HOWEVER, the bag simply cannot be put back into its sack UNDER ANY CIRCUMSTANCES, making the packed volume specification a total lie.Even machine packed by the factory this thing is really difficult to get out of the sack, and it's truly impossible to get back in. The headache this brings packing it back up every night is simply not worth it, so I returned it to the store and will buy a bag whose designers put a bit more thought into the user experience. Massive PITA to save what, 2g of extra sack weight for a sack that fits?
| Snowys Comfort Rating | −1 °C |
| Lower Limit | −7 °C |
| Shape | Tapered Rectangle |
| Max. User Height | 183 cm |
| Internal Girth | 152 cm Chest | 146 cm Hip | 102 cm Foot |
