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Expander Travel Liner

Protect your sleeping bag from your end of day dirt

$29.95 – $49.95

Size Guide

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.


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The Expander™ sleeping bag liner is a super soft and stretchy poly-cotton making it wonderfully stretchy and warm. It's an ideal choice for travel, backpacking and any activity or adventure where you want to keep your sleeping bag clean or add additional warmth to your sleeping bag. The built-in antimicrobial treatment keeps odors at bay and won't wash out of the liner when you throw it in the washing machine. This is the perfect travel companion if you're wanting a luxuriously comfortable sleep.

Learn more about which liner is right for you HERE

Does the Expander Travel Liner…?

  • Have enough space in the Traveller Pillow Slip for an Aeros Pillow?  The built-in pillow slip in the Traveller liner is designed to meet hostel association specifications. They measure 15” / 38cm deep and 36” / 92cm wide. Aeros Pillows in sizes Regular and Large will fit into the pillow slip, but a Deluxe Pillow is a little too large.


Packed Size Comparison

Single:  Paperback book (summer reading size)
Double: Two ready-made rice packets


Mummy: 12 oz ≈ Two tubes of toothpaste
Traveller w/ Pillow Insert: 13.4 oz ≈ Lighter than a roll of paper towels
Rectangular: 11 oz ≈ Slightly less than two apples or one huge crispy apple
Long Rectangular: 12.4 oz ≈ Two tubes of toothpaste
Double: 21.9 oz ≈ 20oz cup of coffee


Feels like your favorite t-shirt


  • Premium stretch knit fabric that can expand twice its width
  • Anti-microbial protection keeps liner fresh, hygienic and odor-free
  • Double folded and reinforced seams
  • Extends the life of sleeping bags by keeping them clean
  • Easy care, machine washable


Easy to wash and helps to keep your down bag cleaner for longer.

Technical Features


Our air mats and expander liners are permanently treated with a CA-16 silver treatment from Thompson Research Associates. This is mixed into the TPU before the extrusion lamination to ensure a permanent germ killing effect inside every Air Sprung Cell™ mat. The treatment is applied to the yarn before weaving into a fabric to ensure a permanent application.

Tech Specs

Product Details

Comes With
Storage case
Stretch knit cotton and polyester blend (35/65)
Anti-microbial protection
6 ft 10 in x 36 in / 210 x 92 cm
6.5 x 3 x 5 in / 16.5 x 8 x 13 cm
12 oz / 340g
7 ft 1 in x 36 in / 225 x 92 cm
7 x 4 x 5 in / 18.5 x 9.5 x 13 cm
13.4 oz / 380g
6 ft 1 in x 36 in / 185 x 92 cm
6.5 x 3 x 5 in / 16.5 x 8 x 13 cm
11 oz / 310g
7ft x 1 in x 36 in / 208 x 91 cm
5 x 6.5 x 3.5 in / 12.7 x 16.5 x 7 cm
13.4 oz / 380g
6 ft 1 in x 73 in / 185 x 185 cm
7 x 5 x 4.5 in / 18.5 x 13 x 12 cm
21.9 oz / 620g

Customer Reviews

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