Liners

Sleeping bag liners are thin, lightweight fabric inserts that go inside your sleeping bag, similar to how bed sheets go inside a duvet cover. They're designed to add warmth, cleanliness, and comfort when you're camping, hiking, or backpacking.

Main Purposes of a Sleeping Bag Liner:

  1. Warmth Boost: Adds 2°C to 10°C of extra warmth (depending on material)

  2. Hygiene: Keeps your sleeping bag clean by acting as a barrier between your body and the insulation

  3. Comfort: Feels softer and more comfortable, especially if your sleeping bag interior is synthetic or rough

  4. Versatility: Can be used on its own as a lightweight sleep option in warm climates or hostels

  5. Easy to Clean: Much easier to wash a liner than a full sleeping bag

Common Liner Materials:

MaterialWarmthWeightFeelProsCons
Silk Light–moderate Ultra-light Smooth Very packable, soft, breathable Expensive
Cotton Low Heavy Soft Inexpensive, durable Bulky, slow to dry
Fleece High Heavy Warm Great for cold conditions Bulky and heavy
Thermolite® Moderate–high Light Soft/stretchy Adds real warmth, dries fast Slightly bulkier than silk
Synthetic blends Varies Light–medium Varies Affordable, moisture-wicking Not as soft as silk

When to Use a Sleeping Bag Liner:

  • Cold-weather hiking – for added insulation

  • Hot climates or hostels – use liner alone without a sleeping bag

  • Multi-day treks – to reduce how often you need to wash your sleeping bag

  • Ultralight trips – silk or Thermolite liners add warmth without bulk

Summary:

A sleeping bag liner is a smart, lightweight gear addition that improves hygiene, comfort, and warmth without adding much weight. They're especially valuable for:

  • Hikers and backpackers who want to extend their sleeping bag’s range

  • Travelers sleeping in hostels or questionable bedding

  • Campers looking for an easy way to stay cleaner and more comfortable

Want help picking the right type for your trip or climate?