Therm-a-Rest Hyperion 20 Sleeping Bag Review

The Therm-a-Rest Hyperion 20 is an ultralight down sleeping bag designed for again sleepers that weighs 20 ounces (1 lb 4 oz) and is insulated with 900 fill energy waterproof down. It has a box-baffled development to eradicate chilly spots and a half-length zipper to save lots of weight. When stuffed the Hyperion 20 packs down to simply 3L making it good for journeys the place pack house is at a premium. The insulation is zoned with 70% on prime and 30%, leveraging your sleeping pad insulation for heat. What’s the catch? It has a tapered minimize with restricted girth, however in case you can match inside comfortably, it’s a candy ultralight sleeping bag.

RELATED: 10 Best Down Sleeping Bags for Backpacking

Specs at a Glance

• Gender: Unisex
• Weight: 20 oz (1 lb 4 oz) – Size Medium, Length 72″
• Fill Weight: 12.5 oz
• Sizes: S, M, L
• Type: Mummy
• Packed Size: 3L
• EN Comfort Temperature Rating: 32F (-6C)
• EN Limit Temperature Rating: 20F (-23C)
• Construction: Box Baffled
• Girth/Hips/Footbox (measurement common): 57″, 49.5″, 43″
• Insulation: 900 Fill Goose Nikwax Hydrophobic Down RDS
• Zipper: Half-Zipper
• Zipper Side: Left
• Draft Tube: Yes
• Shell/Liner Fabric: 10D Nylon RipStop with DWR / 10D Nylon RipStop
• Stuff Sack: Compression sack included and a material storage bag
• Visit Therm-a-Rest for full Specs

Zoned Insulation

The Hyperion 20 sleeping bag is a backpacking and mountaineering mummy-style sleeping bag designed for again sleepers. I can’t emphasize the latter extra. The insulation is distributed in a zonal style with 70% on prime and 30% beneath you, leveraging the chilly resistance of your sleeping pad to maintain you heat. If you roll over onto your aspect, you’ll sleep a lot colder than in case you sleep in your again with the majority of the goose-down insulation on prime of your torso. To forestall this, the Hyperion 20 comes with elective sleeping pad straps that connect with loops on the again of the bag. These act equally to quilt-pad attachment straps to maintain you in your sleeping pad at evening.

Ultralight Design Features

At simply 20 oz, how did Therm-a-Rest make this sleeping bag so light-weight?

First off, the sleeping bag is sort of tapered and is designed to fit your needs with out a whole lot of additional inner house. I can match into its 57″ shoulder girth (measurement common) however there isn’t a complete lot of additional room for me inside from my waist up. The footbox is relatively spacious, nonetheless, and my ft can simply splay aside comfortably.

The Hyperion is insulated with 900 fill energy Nikwax waterproof goose down which is premium stuff by way of warmth-to-weight ratio. Higher fill energy down like this gives extra heat by weight than decrease fill energy down and is used to save lots of weight.

While the Hyperion 20 has a two-way zipper, it’s solely half-length, so it ends at my knees: this protects weight by eliminating the necessity for an extended zipper, draft tube, and anti-snag taping, which might be discovered on the higher half of the zipper. The two-way zipper makes it potential to vent the bag to a sure extent, though not within the footbox. If you get habitually scorching ft or you could camp in highly regarded/humid climate, I’d get a distinct sleeping bag with a full-length zipper as a substitute.

The light-weight 10d ripstop nylon cloth on the Hyperion is considerably delicate and also you’ll wish to deal with it gently to stop it from tearing. The anti-snag tape alongside the zipper draft tube helps forestall rips, however you’ll wish to watch out with it nonetheless.

The hood is a reasonably commonplace mummy hood with a right-side management to allow you to cinch the hood closed. It doesn’t have house for a pillow or something, however it should transfer with you in case you roll over like a jacket. A snap on the prime of the aspect zipper helps seal the hood on the left aspect and keep its form even when the aspect zipper will not be absolutely closed.

Recommendation

The Therm-a-Rest Hyperion 20 is an ultralight sleeping bag designed for again sleepers preferring the draft-free efficiency of a sleeping bag over a backpacking quilt. Weighing 1 lb 4 oz, it’s optimized for backpacking journeys the place house and weight are a premium. It is by far one of many lightest sleeping obtainable at present but it surely’s a cosy match, tougher to vent, and greatest utilized in cooler temperatures relatively than scorching and humid ones. The benefit of utilizing a sleeping bag like this over utilizing a backpacking quilt, apart from the plain low weight and packability, is that you just’ll have a draft-free expertise as a result of it’s utterly enclosed. The drawback is that it has a narrower temperature vary and you may’t aspect sleep with it. But in case you favor a sleeping bag, you again sleep, and wish a bag for cooler, shoulder season (spring and autumn) climate, it’s a high-performance selection.  A 32-degree mannequin can be obtainable.

Disclosure: Therm-a-Rest donated a sleeping bag for evaluate.

SectionHiker is reader-supported. We independently analysis, check, and charge the most effective merchandise. We solely become profitable if you buy a product by our affiliate hyperlinks. Help us proceed to check and write unsponsored and unbiased gear critiques, newbie FAQs, and free climbing guides.