Therm-a-Rest Hyperion 20F Sleeping Bag – So Warm, So light, So Comfy

The Therm-a-Rest Hyperion 20F Sleeping Bag is tempting.  It can be hard taking a new piece of gear into the field for a long time when you haven’t used it before. If the product doesn’t deliver, you’re stuck with it for the rest of the trip and a piece of gear as essential as a sleeping bag felt like a real risk. But man am I glad I took the Hyperion on my backpacking trip! Weighing in at just 1 lb 4 oz., this is one of the lightest bags on the market.
Therm-a-Rest Hyperion 20F Sleeping Bag

Hyperion and NeoAir UberLite combo while occupied

Remarkably lightweight and warm

When I buy a new sleeping bag the two main things I look at are:
1. temperature rating and
2. weight
Therm-a-Rest Hyperion 20F Sleeping Bag

Hyperion stuffed – so small

We all know that the temperature rating is often skewed. If we are sleeping in 30º we need a 20º bag, if we are sleeping in under 20º we need a 0º… etc. Well, say goodbye to temp rating mistrust! Therm-a-rest has thoroughly impressed me with the Hyperion 20º. I took it on a 5-day backpacking trip and not only saved a lot of weight and space but stayed warmer than I expected each night. 
Therm-a-Rest Hyperion 20F Sleeping Bag

ag with the 1/2 zip open

900 RDS Down

The down is strategically placed with 70% on top and sides and 30% on the bottom which saves weight while maintaining its 20º rating. The 900 Fill Goose is NHD (Nikwax Hydrophobic Down) meaning it is 50x more waterproof than your average down and will keep you warm despite moisture. The RDS (Responsible Down Standard) ensures that the geese were not subjected to unnecessary harm. 
I started noticing a difference between this bag and others right away, starting with when I packed my backpack. In its stuff sack, it’s only slightly bigger than a Nalgene and saved me a ton of room allowing me to carry other items with ease (like a lot of Swedish Fish and a big medkit). Since we were headed into the alpine we had rock climbing gear and helmets and the compression ability of this bag really saved my butt, I don’t think I would have been able to fit everything in my 65L pack otherwise.

See Eliza’s review of the Therm-a-Rest NeoAir UberLite too

Therm-a-Rest Hyperion 20F Sleeping Bag

bag and pad combo unoccupied

Once on the trail, I was able to move faster than I expected and saved a lot of energy carrying less weight. As this was an institutional course and I was an instructor, I needed to be able to move faster than the students and I can thank this ultra-light gear for helping me be successful in that department. 
Therm-a-Rest Hyperion 20F Sleeping Bag

Bag-pad attachment system

Bonus Features of the Hyperion Sleeping Bag

The Hyperion is available in small, medium and large to accommodate your size. This can eliminate both a baggy sleeping bag and one that is too short. Another feature is the two small straps on the bottom which attach to your sleeping pad and keep it secure. Personally, I found this feature not very helpful. I slept in it both with and without the straps attached to the sleeping pad and seemed to stay on the pad more without attaching it.
I think this is because I like to sleep on my side and when I rolled over it pushed the pad behind me. The 10D Nylon RipStop with DWR gives the bag durability and breathability while still keeping moisture out. I have also found the 1/2 length zipper to be catch-free, bid farewell to the continually snagging zipper!



Eliza Lockhart

Eliza Lockhart

Eliza Lockhart

Growing up snowboarding and hiking in the bitter cold winters and humid summers of northern Vermont, Eliza learned how to beat up gear and quickly became infatuated with new technologies. After moving to Colorado in 2015 to pursue a degree in recreation and outdoor education at Western Colorado University, her passion for the outdoors grew exponentially. Soon after, she picked up rock climbing, telemark skiing, backpacking, canyoneering, and is slowly learning to love rafting. Through these learning processes, Eliza began to understand the importance of the right gear and hopes to share her experiences and knowledge with others through Engearment.

Eliza Lockhart in water

Now working for Beacon Guidebooks as the ‘Wearer of Many Hats’ (yes, that is her official title), Eliza has learned the ins and outs of the outdoor industry. She has also worked on marketing teams, as a photographer, media coordinator, outdoor instructor and as a wrangler. She is especially excited to encourage other women in the outdoors and is an advocate for diversity and inclusion.

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