Frugal Hiker: Aegismax Thermolite sleeping bag liner

$27 USD Aegismax Thermolite liner

~$63 USD S2S Thermolite Reactor liner

The Aegismax Thermolite sleeping bag liner is available for $27.30 USD delivered on Aliexpress.

Extra layer that boosts warmth and protects against dirt and sweat

Helps extend the usable life of your bag; is easily washable

Similar to the ~$55 USD Sea to Summit Thermolite Reactor liner

Mummy and rectangular versions

Open: 210 x 83 x 38cm

Packed: 8 x 12cm diameter roll

262g

Discounts (USD):

$2 off $60 at Aegismax factory store

The Aegismax MLT5 is a sleeping bag liner similar to the Sea to Summit Thermolite Reactor.

Both have a mummy shape, and both use lightweight and breathable Thermolite material that adds ~2-5C to your sleeping bag rating.

Specifications

Material: Thermolite (likely 80g/m²)
Dimensions: 210 x 83 x 38cm
Packed: 8 x 12cm diameter roll
Weight: 262g
Colour: black

As comparison, the S2S Thermolite Reactor:

Uses similar material
Is the same length (210cm)
Is 7cm wider (90 vs 83cm)
Is 14g lighter (248 vs 262g)
Has a sewn footbox
Has a cinching drawcord and red trim around the hood
Is substantially more expensive (~ $55 vs $29.40 USD)

Pros

Thermolite material is breathable, soft, stretchy and comfortable
Washing your liner on long treks helps minimize smells
Also use as a sheet on hotel/hostel beds, or as a blanket on airplanes
Also available in shorter and rectangular bag versions, and in a thicker orange version
Can be machine washed

Cons

Extra weight and bulk in your pack
Lacks some features of the S2S bags

No footbox - might feel constricting
No cinching cord to secure the hood close to your head

Thermolite won't protect much against wind or insects, or boost warmth inside a sleeping bag by a large amount (despite S2S claims)
A warmer sleeping bag is probably better from a weight ratio perspective
Not recommended to use alone unless conditions are very warm
Silk is more effective as a liner material (but is expensive and difficult to clean)
Black colour appears more grey than black