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Unisex

Sea To Summit Reactor sleeping bag

Name: Sea to summit Reactor sleeping bag
Brand: Sea to summit
SKU: 140608921
Price: 56.99 EUR
Availability: InStock
Rating: 5 (4 reviews)

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4 Reviews

4 Questions

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Long

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Features of Sea to summit Reactor

Product description of Sea To Summit Reactor sleeping bag

Description summary

Boost your sleep system´s warmth and versatility with the Sea to Summit Reactor sleeping bag liner. This ultralight, mummy-shaped liner uses Thermolite® Pro and EcoMad technology to significantly enhance your sleeping bag´s thermal performance, letting you camp in colder conditions. It also doubles as a standalone bag for warmer nights or hostels. HeiQ Fresh odor control keeps things clean, and machine washability preserves your main bag. Compact and easy to pack, it´s the essential upgrade for any adventurer

Elevate Your Outdoor Comfort: Sea to Summit Reactor Insulated Sleeping Bag Liner

Unlock a new level of warmth and versatility on your adventures with the Sea to Summit Reactor sleeping bag liner. Engineered for adult adventurers who demand more from their gear, this high-performance liner acts as a thermal-boosting second skin for your sleeping bag. Whether you´re a backpacker pushing the limits of a three-season bag, a traveller seeking a hygienic layer, or a camper wanting extra coziness on a chilly night, the Reactor is your lightweight, packable solution for a better night´s sleep.

The primary benefit of the Reactor is its incredible ability to significantly upgrade the thermal performance of your existing sleeping bag. By integrating advanced Thermolite® Pro and Thermolite® EcoMad technologies, this insulated synthetic liner traps air efficiently, adding crucial degrees of warmth without the bulk and weight of a heavier sleeping bag. This allows you to extend your camping season and venture into colder environments with confidence. On warmer nights, it performs brilliantly as a standalone ultralight sleeping bag, perfect for minimalist trips or staying in hostels.

Designed for both men and women, its intelligent mummy shape mirrors the contours of technical sleeping bags, ensuring maximum thermal efficiency and eliminating cold spots. The integrated hood can be cinched down to trap precious body heat, and the convenient zipper closure allows for easy entry and exit. Furthermore, the fabric is treated with HeiQ Fresh odour control technology, which helps keep the liner and your main sleeping bag fresher for longer on multi-day excursions. Keeping your primary sleeping bag clean has never been easier; simply use the Reactor liner and machine wash it when you return home, preserving the life and loft of your more expensive equipment.

Key Features:

* Advanced Thermal Performance: Utilises a blend of innovative insulation technologies to add significant warmth to your sleep system.
* Ergonomic Mummy Shape: Tapered design with a spacious footbox and a full hood provides a comfortable, thermally efficient fit inside your sleeping bag.
* Versatile Use: Functions as a powerful thermal liner in the cold and as a compact, standalone sleeping bag in warm conditions.
* Hygienic and Easy to Maintain: Keeps your sleeping bag clean, extending its lifespan, and is conveniently machine washable for effortless care.
* Ultralight and Compact: Packs down incredibly small into its own included pouch, adding minimal weight and volume to your pack.

Technical Specifications

Zipper closure:Yes.

Leg welts:Yes.

Product colour:Black.

Specific features:HeiQ Fresh odour control technology, Thermolite® Pro and Thermolite® EcoMad technologies.

Hooded:Yes.

Pouch:Yes.

Machine washable:Yes.

Recommended age group:Adult.

Type:Mummy sleeping bag.

Material:Polyester.

Width:800 mm.

Weight:265 g.

Length:206 cm.

Package width:15x7x11 cm.

Carrying case:Yes.

Specifications

Manual

Technical specifications of Sea to summit Reactor

Total weight

265 g
Packed size

15x7x11 cm
Size and max user height

206 cm
Bag shape

Mummy
Zipper side

Yes
Color

Yellow
Gender

Men
Gender

Women
Age

Adult
Insulation

Insulated synthetic

Features of Sea to summit Reactor

Color Yellow

Color

Yellow

Gender Men

Gender

Men

Women

Age Adult

Age

Adult

Insulation Insulated synthetic

Insulation

Insulated synthetic

Key differentiators

Adds significant warmth to your existing sleeping bag with Thermolite® synthetic insulation.

Features a mummy shape with a hood for improved thermal efficiency.

Functions as a versatile standalone sleeping bag for warmer weather.

Includes a compression sack for compact packing (1.5L compressed volume).

Machine washable for easy care and maintenance of your sleep system.

Treated with HeiQ Fresh for long-lasting odor control.

Technology in Sea To Summit Reactor sleeping bag

Energy rating

Warnings

5 / 5

4 Reviews

What our customers are saying about Sea To Summit Reactor sleeping bag

Excellent

2026/06/13

Antonio

I have tried it at home and I find it excellent

good produkt

2026/05/26

sergejs

Compact and easy to wash. Can be used as a light blanket in warm weather. Recommended.

Great

2026/05/20

Julen

Inner bag ideal for not dirtying the sleeping bag, for gaining a few extra degrees, or for use as a sheet on a normal bed

Good buy

2025/09/05

Alejandro

We used this sleeping bag on a trek with many nights in a tent above 4,000 meters and sub-zero nights in the Andes. It's clearly a warmer sleep aid and has a very pleasant texture. I don't know if it provides as many extra degrees of comfort as claimed, but it's definitely a plus. It's also light and takes up little space. Getting in and putting it on can be a bit tedious until you get used to it. Then, once inside, it's spacious. I'm happy with the purchase and I'm sure I would have suffered on those cold nights if I hadn't.

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Include AI Generated questions and answers

2026-07-28

Generated by AI and verified

Is the Sea to Summit Reactor sleeping bag liner machine washable?

Answer of Generated by AI and verified

Yes, the Sea to Summit Reactor sleeping bag liner is machine washable. This makes it easy to maintain and helps preserve the life of your main sleeping bag by keeping it cleaner.

* Generated by AI based on customer and product data

2026-07-28

Generated by AI and verified

What is the shape and insulation type of the Reactor liner?

Answer of Generated by AI and verified

The Sea to Summit Reactor liner features a mummy shape, which is designed to be thermally efficient. It is filled with synthetic insulation and utilizes Thermolite® brand technology to enhance warmth.

* Generated by AI based on customer and product data

2026-07-28

Generated by AI and verified

What are the temperature ratings for this sleeping bag liner?

Answer of Generated by AI and verified

It is designed to significantly boost the thermal performance of your main sleeping bag.

* Generated by AI based on customer and product data

2026-07-28

Generated by AI and verified

Can I use the Reactor liner by itself without a sleeping bag?

Answer of Generated by AI and verified

Yes, you can. While the Reactor liner is designed to boost the performance of another sleeping bag in colder conditions, it also functions effectively as a standalone ultralight sleeping bag for warmer nights, minimalist trips, or for use in hostels.

* Generated by AI based on customer and product data

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Frequently bought together

Best sellers

Use cases

Three-Season Camping 100% Fit

With a 3-season rating and a comfort temperature of 0 °C, this bag is designed for reliable performance during spring, summer, and autumn trips in moderate climates.

3-Season rating,0 °C comfort temperature,Synthetic insulation

Backpacking & Hiking 80% Fit

The sleeping bag includes a compression sack and packs down to a low volume, making it a practical choice for multi-day hikes where pack space is important.

Compression sack included,Compressed volume: 1.5,Mummy shape

Beginner Outdoor Adventures 90% Fit

This bag offers a great balance of features for those new to camping. The reliable synthetic insulation and mummy shape provide warmth and comfort without complex maintenance.

Synthetic fill_material,Mummy shape,Hood included

Car Camping & Festivals 85% Fit

The durable polyester outer material and comfortable lining make this a dependable and cozy option for casual camping trips where pack weight is not the primary concern.

Polyester outer_material,Polyester lining_material,3-Season rating

Best for

Best for Weekend Hikers & Climbers

This sleeping bag's durable construction and reliable 3-season performance make it a solid choice for those who need gear that can handle regular outdoor use.

Based on product features

Great for Campers

Offering reliable 3-season warmth and practical features like a compression sack at an accessible price point, this bag is ideal for students and those on a tight budget.

Based on product features

Benefits

FunctionalReady for Adventures from Spring Through Autumn

Designed as a 3-season sleeping bag, this product offers reliable performance for camping and backpacking across a wide range of cooler conditions. Its comfort temperature rating of 0 °C ensures you stay comfortable on cool to cold nights.

season_rating: 3-Season

temp_rating_comfort: 0 °C

FunctionalWarm with an Insulated Hood and Mummy Shape

This sleeping bag features a mummy shape and an included hood, which are designed to enhance heat retention by minimizing empty space and protecting your head from the cold. The design is complemented by Thermolite synthetic insulation for consistent warmth.

shape: Mummy

hood: yes

insulation_brand: Thermolite

fill_material: Synthetic

FunctionalPacks Small for Easy Transport on the Trail

Ideal for backpackers and travelers who need to save space, this sleeping bag packs down to a compressed volume of just 1.5 liters. It also includes a compression sack, making it easy to stow in your pack for any adventure.

compressed_volume: 1.5

compression_sack_included: yes

Ideal buyer profiles

The Three-Season Backpacker

This individual frequently camps from spring through autumn and needs reliable gear that performs in a range of temperatures without being overly specialized. They value practicality, durability, and ease of maintenance for their multi-day trips.

The Sea to Summit Reactor is ideal for this user. Its 3-season rating and 0 °C comfort temperature provide warmth for cool nights, while the synthetic Thermolite,, and insulation performs reliably. The included compression sack helps manage pack space, and its machine-washable nature makes post-trip cleanup straightforward.

The Car Camper Seeking Comfort

This person enjoys the outdoors from the convenience of a campsite accessible by vehicle. They prioritize comfort and a good night's sleep over minimizing weight and bulk, and they appreciate gear that is simple to use and maintain.

With a comfort rating of 0 °C, this bag offers ample warmth for typical car camping scenarios. The mummy shape with an included hood enhances heat retention and comfort. Since it's machine washable, it's easy to keep fresh between trips, which is a significant plus for casual campers.

The Minimalist Hiker

This hiker focuses on covering distances efficiently and wants gear that is lightweight and highly compressible to minimize their pack load. They are meticulous about selecting items that offer the best performance-to-weight ratio for their adventures.

This sleeping bag meets the minimalist's needs with a compressed volume of just 1.5 liters, making it highly packable. The synthetic insulation provides dependable warmth, and the mummy shape is thermally efficient. The included compression sack ensures it takes up minimal space in a pack, aligning perfectly with a minimalist gear philosophy.

Competitive features

When evaluating the Sea to Summit Reactor Sleeping Bag against other options, it's essential to recognize its primary function as a sleeping bag liner. While the other products listed are standalone sleeping bags, the Reactor is designed to enhance the thermal performance of an existing sleep system or be used on its own in very warm conditions. This fundamental difference in product type is key to understanding its place in the market.

Where it excels

Versatility: The Reactor liner adds warmth to a primary sleeping bag for colder trips and can function as a standalone bag for warm-weather travel or hostel stays. | Performance Enhancement: It utilizes Thermolite® Pro and EcoMad technology to significantly boost the thermal performance of your existing sleeping bag. | Maintenance and Hygiene: Featuring HeiQ Fresh odor control and being machine washable, the liner helps keep your main sleeping bag cleaner for longer, simplifying maintenance.

Consider alternatives if...

Standalone Cold-Weather Use: If you need a single sleeping bag for cool or cold conditions, a dedicated, insulated sleeping bag like the or High Peak Redwood-3 would be a more appropriate choice, as the Reactor is a liner and not a complete sleep system on its own.

Verdict

The Sea to Summit Reactor is not a direct competitor to traditional sleeping bags but rather a specialized accessory for enhancing them. It excels in its role as a versatile, performance-boosting liner. For adventurers looking to extend the temperature range of their current gear or needing an ultralight option for warm climates, the Reactor is an excellent investment. However, those seeking a primary sleeping bag for general camping should look at dedicated sleeping bag models.

Specs comparison

	Sea To Summit Reactor sleeping bag	Sea To Summit Boab-9c Sleeping Bag	Sea To Summit Boab-9c Sleeping Bag Refurbished
Compression Sack Included	true	false	false
Insulation Type	synthetic	Synthetic Insulation	Synthetic Insulation
Outer Material	Polyester	-	Ripstop Nylon
Shape	Mummy	Mummy	Mummy
Lining Material	Polyester	-	Polyester
Draft Tube	false	true	true
Zipper Location	Side	Side	Side
Season Rating	3-Season	3-Season	3-Season
Fill Material	Synthetic	Synthetic	Synthetic
Hood	true	true	-
Temperature Rating	C	9°C	9°C
Compressed Volume	1.5	20	20 liters
Shape Of Sleeping Bag	Mummy	-	Mummy
Temp Rating Comfort	0 °C	9 °C	9 °C
Temp Rating Lower	-20 °C	-	-10 °C
Zipper Side	Yes	Full-length Side Zip	Full-length side zip
Insulation Brand	Thermolite	ThermicFibre	High-Loft Hollowfibre
Total Weight	265 g	1.34 kg / 2.9 lbs	1.34 kg / 2.9 lbs

Specs vs competitors

	Sea To Summit Reactor sleeping bag	High Peak Century 300 Sleeping Bag	High Peak Redwood-3 Sleeping Bag
Hood Included	true	-	true
Compression Sack Included	true	true	true
Insulation Type	synthetic	synthetic	synthetic
Outer Material	Polyester	210t Polyester Rudolf Bionic Eco Finish	210t Polyester Rip Stop Print
Shape	Mummy	Mummy	Mummy
Lining Material	Polyester	Polyester	Polyester
Draft Tube	false	false	false
Zipper Location	Side	Center	Left
Season Rating	3-Season	3-Season	3-Season
Fill Material	Synthetic	Synthetic	Synthetic
Hood	true	true	true
Temperature Rating	C	5 to -5 °C	5 to -5 °C
Compressed Volume	1.5	0	-
Shape Of Sleeping Bag	Mummy	Mummy	Mummy
Temp Rating Comfort	0 °C	5 °C	5 °C
Temp Rating Lower	-20 °C	-5 °C	-5 °C
Zipper Side	Yes	Center	Left
Insulation Brand	Thermolite	Dura Loft	Dura Loft H4
Total Weight	265 g	910 G	870 g