# Sleeping bag liner SEA TO SUMMIT Reactor Midweight R – beluga, insulating liner for midweight bags

**URL:** https://aio.lv/en/product--sea-to-summit-9327868169825--12372848
**Data updated:** 2026-04-26 20:45 (EEST)
**Category:** Sleeping Bags
**Manufacturer:** SEA TO SUMMIT
**Manufacturer code:** 9327868169825
**EAN:** 9327868169825
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

SEA TO SUMMIT Reactor Midweight R beluga is a sleeping bag liner designed to add warmth and hygiene to midweight sleeping bags. The liner increases thermal comfort, protects the bag from dirt and sweat, and is suitable for camping, backpacking and travel use. Lightweight and compressible, it pairs with midweight bags to extend sleeping temperature range and ease cleaning.

## Long description

The SEA TO SUMMIT Reactor Midweight R beluga is an insulating sleeping bag liner engineered to increase warmth and maintain hygiene inside midweight sleeping bags. Made to be lightweight and highly compressible, this liner slips into a compatible sleeping bag to raise thermal comfort, reduce the need for frequent washing of the main bag, and provide a soft, clean surface against the skin. Its neutral beluga color and compact pack size make it practical for camping, backpacking and travel.
Advantages
The Reactor Midweight R adds measurable insulation to a midweight sleeping bag while remaining light to carry and easy to pack. It protects the interior of the sleeping bag from sweat, oils and dirt, extending the life of the bag and simplifying maintenance. The liner’s fabric is chosen for comfort against the skin and for fast-drying properties, which helps when airing or washing the liner on trips. Compatibility with midweight bag designs means the liner integrates without significantly changing fit or weight distribution.
Suitable for
Campers and backpackers who need extra warmth without a bulkier bag
Travelers who prefer a hygienic, washable layer inside shared or rented sleeping bags
Multi-season users extending the lower-temperature performance of a midweight sleeping bag
Lightweight packers who require compressible insulation that stows easily
When it may not be suitable
This liner is designed specifically to complement midweight sleeping bags; it may not provide sufficient warmth if used alone in very cold conditions or with a lightweight summer bag. Users requiring extreme cold-weather insulation should consider a dedicated heavy-duty liner or a colder-rated sleeping bag. Also, if exact mummy-bag shaping or integrated hood features are required, the simple liner shape may not fully match those needs.
Key specifications
Type: insulating sleeping bag liner for midweight bags
Intended use: camping, backpacking and travel
Weight: lightweight and packable
Thermal effect: raises sleeping bag warmth by designed midweight increment
Material properties: soft next-to-skin fabric with fast-drying characteristics
Color: beluga (neutral tone)
How to use
Open your midweight sleeping bag fully and insert the Reactor Midweight R liner with the smooth side against your skin. Align the liner so seams match the bag’s interior and smooth any folds to avoid cold spots. Close the sleeping bag as usual; the liner will add insulation and act as a barrier against sweat and dirt. Remove the liner for washing or airing after use; its compressible nature makes packing it back into a stuff sack straightforward.
What to consider before purchase
Confirm compatibility with your sleeping bag size and shape to ensure proper fit
Assess the additional warmth you need — this is intended to complement midweight bags rather than replace a colder-rated bag
Check care instructions for washing and drying to match your trip maintenance plans
Usage recommendations
For best performance, use the Reactor Midweight R inside a midweight sleeping bag of matching size; allow the liner to dry between trips and remove it for machine washing when needed to keep the main bag cleaner and extend its service life.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All SEA TO SUMMIT products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized SEA TO SUMMIT service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12372848/68741314_large.webp