Regular || Reactor Fleeceweight Liner
Regular
Regular || Reactor Fleeceweight Liner
Regular
Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner
New
Regular || Reactor Fleeceweight Liner
Regular
Regular || Reactor Fleeceweight Liner
Regular
Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner
New

Reactor Fleeceweight Sleeping Bag Liner

$109.99
  • Size

View Tech Specs

in stock Enjoy free express shipping*

Buy with
Highlights

Best UseCold-weather backpacking, Ski touring, (Stand-alone) summer use

Length193cm | 76in

Packed Weight421 g | 14.9 oz

Packed Size25 × 15 × 15 cm | 10 × 6 × 6 in

Performance
Weight
  • Ultralight
  • Lightweight
  • Midweight
Packability
  • Ultra Compact
  • Compact
  • Midsize
About The Product

Boost your sleep system’s warmth with the Reactor Fleeceweight. Thermolite® hollow-core fibres and grid fleece trap and reflect body heat, adding up to 8°C|14°F with minimal weight. The stretch fleece and arm openings allow freedom of movement, while snap attachments fit Sea to Summit sleeping bags for easy access. Easy to clean and quick-drying, it features HeiQ Fresh odour control. Using a liner reduces sleeping bag washes, helping preserve loft and extend lifespan.

Product Features
  • Boosts Sleep System Warmth – Reactor Fleeceweight uses Thermolite® hollow-core fibres and grid fleece to trap warmth with minimal added weight
  • Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
  • Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk

Learn more

Item Not Eligible For Returns

The following items cannot be returned to us if you change your mind, the sizing is incorrect or if you feel that the product does not meet your expectations.

  • Safety Equipment
  • Sleeping Bags
  • Sleeping Liners
  • Pillows
  • Face Masks
  • Gift Cards

However, if a product fails to meet a Consumer Guarantee (refer to our Warranty Policy) then this exclusion will not apply to a Product that fails to meet one or more Consumer Guarantees.

Shipping & Returns

Free Express shipping via Australia Post within Australia for orders over $99.*

All orders under $99 incur a $12 shipping fee for delivery within Australia.

*Does not include bulky items. Orders with bulky items incur an additional freight charge within Australia during the checkout process.

For more details, check out our Shipping Policy.

We do not ship to an address outside of Australia.

If you are not entirely satisfied with your order, you may be entitled to a refund of the purchase price of the Product. For more details, please check out our Refund Policy.

Find Locally
Regular || Reactor Fleeceweight Liner

Reactor Fleeceweight Sleeping Bag Liner Regular

Regular || Reactor Fleeceweight Liner

Reactor Fleeceweight Sleeping Bag Liner Regular

Description || Reactor Fleeceweight Liner

Features

  • Boosts Sleep System Warmth – Reactor Fleeceweight uses Thermolite® hollow-core fibres and grid fleece to trap warmth with minimal added weight
  • Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
  • Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk
  • Stay Fresh Longer – HeiQ Fresh odour control technology keeps the liner fresh after extended use
  • Sleep System Integration – Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit
  • Easy to Keep Clean – Machine washable construction simplifies care and reduces wear on your sleeping bag over time
  • Lower Impact Materials – Crafted with certified recycled fibres and bluesign APPROVED materials to minimise environmental impact
  • Can be used on its own as a lightweight sleeping bag in warm-weather conditions

Technical Features

HEIQ Fresh
0123 Thermolite EcoMade All Season

Tech specs

  • Best Use
    Cold-weather backpacking, Ski touring, (Stand-alone) summer use
  • Materials
    100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester
Short
Regular
Long
  ShortRegularLong
Weight365 g12.9 oz400 g14.1 oz430 g15.2 oz
Dimensions178 × 80 cm70.1 × 31.5 in193 × 80 cm76.0 × 31.5 in206 × 80 cm81.1 × 31.5 in
Packed Size25 × 15 × 15 cm10 × 6 × 6 in25 × 15 × 15 cm10 × 6 × 6 in25 × 15 × 15 cm10 × 6 × 6 in
Recommended User Height170 cm66.93 in185 cm72.83 in198 cm77.95 in

Frequently Asked questions

How much warmth does a Reactor Fleeceweight add to a sleeping bag?

The added warmth depends on how well the sleeping bag retains heat and how well the sleeping mat insulates. When paired with a quality bag and mat, a Reactor Fleeceweight can add up to 8 °C / 14 °F.

Which Reactor is the warmest?

The Reactor Fleeceweight is the warmest option, followed by the Reactor Midweight, and then the Reactor Lightweight.

Can a Reactor Fleeceweight be used for backpacking or biking?

For bikepacking with frame bags or ultralight backpacking, the Reactor Fleeceweight is likely too bulky. Larger winter camping backpacks generally offer enough space.

Can a Reactor be machine washed and dried?

Reactor liners can be machine washed without special soaps. Do not use fabric softeners. Air dry or machine dry on a cool to warm cycle without dryer sheets.

Didn't find what you're looking for?
Click here for more FAQs about Sleeping Bag Liners

Blog

Product Guides

View blog