Sea To Summit Expander Liner Mummy With Hood - Navy
The Expander Liner series are the obvious choice for the price conscious traveller. They are made from a premium stretch-knit poly-cotton material which is super stretchy and even warmer than a standard cotton weave liner. The stretch properties allow the Expander to move with you as you sleep, vastly increasing comfort and minimising tangles. The anti-microbial treatment keeps bacteria at bay as well as prolonging the life of your liner and sleeping bag. The anti-microbial treatment won t wash out of the liner, and does not use nano-sized particles. The treatment is approved for use by the EPA (USA) and is used in many hospitals.
The Expander Liner series are the obvious choice for the price conscious traveller. They are made from a premium stretch-knit poly-cotton material which is super stretchy and even warmer than a standard cotton weave liner. The stretch properties allow the Expander to move with you as you sleep, vastly increasing comfort and minimising tangles. The anti-microbial treatment keeps bacteria at bay as well as prolonging the life of your liner and sleeping bag. The anti-microbial treatment won t wash out of the liner, and does not use nano-sized particles. The treatment is approved for use by the EPA (USA) and is used in many hospitals.
The Expander Liner series are the obvious choice for the price conscious traveller. They are made from a premium stretch-knit poly-cotton material which is super stretchy and even warmer than a standard cotton weave liner. The stretch properties allow the Expander to move with you as you sleep, vastly increasing comfort and minimising tangles. The anti-microbial treatment keeps bacteria at bay as well as prolonging the life of your liner and sleeping bag. The anti-microbial treatment won t wash out of the liner, and does not use nano-sized particles. The treatment is approved for use by the EPA (USA) and is used in many hospitals.
The Expander Liner series are the obvious choice for the price conscious traveller. They are made from a premium stretch-knit poly-cotton material which is super stretchy and even warmer than a standard cotton weave liner. The stretch properties allow the Expander to move with you as you sleep, vastly increasing comfort and minimising tangles. The anti-microbial treatment keeps bacteria at bay as well as prolonging the life of your liner and sleeping bag. The anti-microbial treatment won t wash out of the liner, and does not use nano-sized particles. The treatment is approved for use by the EPA (USA) and is used in many hospitals.
in 5 offers
The lowest price for Sea To Summit Expander Liner Mummy With Hood - Navy right now is $45.38 at Bicycle Store, compared across 4 retailers.
The all-time low was $37.90 on 23 Oct 2025 — today's price is 20% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 11 May 2026.
Last updated at 11/05/2026 22:27:53
Sea To Summit Expander Liner Mummy With Hood - Navy - SUPER SALE
Delivery between 15–19 May $9.95
Sea To Summit Expander Liner Mummy With Hood - Navy - SUPER SALE
Delivery between 15–25 May $9.95
Sea to Summit Expander Liner Navy / Mummy - Valhalla Tactical & Outdoor
Delivery $15
Sea to Summit Expander Liner for Travel, Anti-Microbial, Machine Washable, Navy
Delivery $15
Sea To Summit Expander Liner MUMMY / Navy
Delivery between 14–21 May $35
originally posted on anacondastores.com
This is the first comfy inner that doesn’t feel like a condom! I am a wriggler and find myself waking up in strangulating tangles in my inner sheets. The Sea to Summit system is very generous and stretchy and super comfy. While I can still tangle myself I don’t wake up feeling like a sausage wrapped in glad wrap or a condom! Love this product.
originally posted on seatosummitusa.com
This product is essential and provides guard between my hide and airplane seat or helps keep cleaner down sleeping bag. Can see in dark (bright green). Keeps biting cooties off me! ( I also pack lots of wet wipes in plastic bag--total nerd, but being sick overseas horrible! prevention EVERYTHING).Can relax and sleep. Cozy too. Pull over head and snore away. Your mates will be envious. I use it alone; inside sleeping bag, hostels, air planes, trains, subways, bunks, hotels, busses, sleeping in double bed with others; ALL sketchy or even "luxury" sleeping options.... you don't know who was there before! (total nerd; I bring my own STS towels and pillow covers). Liner washes well; could use alone when hot for sleeping bag, and rolls up into small nothing. Shake out; ... MoreThis product is essential and provides guard between my hide and airplane seat or helps keep cleaner down sleeping bag. Can see in dark (bright green). Keeps biting cooties off me! ( I also pack lots of wet wipes in plastic bag--total nerd, but being sick overseas horrible! prevention EVERYTHING).Can relax and sleep. Cozy too. Pull over head and snore away. Your mates will be envious. I use it alone; inside sleeping bag, hostels, air planes, trains, subways, bunks, hotels, busses, sleeping in double bed with others; ALL sketchy or even "luxury" sleeping options.... you don't know who was there before! (total nerd; I bring my own STS towels and pillow covers). Liner washes well; could use alone when hot for sleeping bag, and rolls up into small nothing. Shake out; roll up. Stuff into pack or bag Secure with rubber band; wrap in plastic; or small water-proof stuff sack. It goes with you! Mine traveled all over the world before global pandemics.Would not think of not having it now. Insect Shield (r) another level of protection . Not just for camping either. General sleeping hygiene product. Sawyer makes a spray product for reapplication of insect shield at REI. Absolutely essential product. Pack mine with nice-smelling dryer sheet. Total nerd.
originally posted on seatosummit.com
I got this for my son for Boyscouts instead of sending him with a much bulkier and heavier twin sheet set because we do so many hiking and camping trips where he carries his own weight. He used it on a 4-day trip where we hammock camped. To save weight, he packed only this liner, a small lightweight travel blanket that folds into about an 8” square pillow, and a sleeping pad for his sleeping system along with his hammock. The temperature dropped from about 80 degrees F to between 50-60 at night and he stayed perfectly comfortable. He liked the liner so much he used it in his bed at home and also took it on a week-long camping trip with the Boyscouts where they slept on cots. Both of us are very satisfied with the purchase. I’m so glad he’s not having to lug around a ... MoreI got this for my son for Boyscouts instead of sending him with a much bulkier and heavier twin sheet set because we do so many hiking and camping trips where he carries his own weight. He used it on a 4-day trip where we hammock camped. To save weight, he packed only this liner, a small lightweight travel blanket that folds into about an 8” square pillow, and a sleeping pad for his sleeping system along with his hammock. The temperature dropped from about 80 degrees F to between 50-60 at night and he stayed perfectly comfortable. He liked the liner so much he used it in his bed at home and also took it on a week-long camping trip with the Boyscouts where they slept on cots. Both of us are very satisfied with the purchase. I’m so glad he’s not having to lug around a ton of weight and also so he has a layer to keep his top-layer sleeping gear clean. The ability to layer is what you need for colder trips and this is a great addition to his gear!
| Shape | Rectangular |
| Outer Material | Cotton |
| Season | All Seasons |
| Seal material type | Cotton |
| Is discontinued by manufacturer | No |
Sea To Summit Expander Liner Mummy With Hood - Navy - SUPER SALE
Delivery between 15–19 May $9.95
Sea To Summit Expander Liner Mummy With Hood - Navy - SUPER SALE
Delivery between 15–25 May $9.95
Sea to Summit Expander Liner Navy / Mummy - Valhalla Tactical & Outdoor
Delivery $15
Sea to Summit Expander Liner for Travel, Anti-Microbial, Machine Washable, Navy
Delivery $15
Sea To Summit Expander Liner MUMMY / Navy
Delivery between 14–21 May $35
This is the first comfy inner that doesn’t feel like a condom! I am a wriggler and find myself waking up in strangulating tangles in my inner sheets. The Sea to Summit system is very generous and stretchy and super comfy. While I can still tangle myself I don’t wake up feeling like a sausage wrapped in glad wrap or a condom! Love this product.
This product is essential and provides guard between my hide and airplane seat or helps keep cleaner down sleeping bag. Can see in dark (bright green). Keeps biting cooties off me! ( I also pack lots of wet wipes in plastic bag--total nerd, but being sick overseas horrible! prevention EVERYTHING).Can relax and sleep. Cozy too. Pull over head and snore away. Your mates will be envious. I use it alone; inside sleeping bag, hostels, air planes, trains, subways, bunks, hotels, busses, sleeping in double bed with others; ALL sketchy or even "luxury" sleeping options.... you don't know who was there before! (total nerd; I bring my own STS towels and pillow covers). Liner washes well; could use alone when hot for sleeping bag, and rolls up into small nothing. Shake out; ... MoreThis product is essential and provides guard between my hide and airplane seat or helps keep cleaner down sleeping bag. Can see in dark (bright green). Keeps biting cooties off me! ( I also pack lots of wet wipes in plastic bag--total nerd, but being sick overseas horrible! prevention EVERYTHING).Can relax and sleep. Cozy too. Pull over head and snore away. Your mates will be envious. I use it alone; inside sleeping bag, hostels, air planes, trains, subways, bunks, hotels, busses, sleeping in double bed with others; ALL sketchy or even "luxury" sleeping options.... you don't know who was there before! (total nerd; I bring my own STS towels and pillow covers). Liner washes well; could use alone when hot for sleeping bag, and rolls up into small nothing. Shake out; roll up. Stuff into pack or bag Secure with rubber band; wrap in plastic; or small water-proof stuff sack. It goes with you! Mine traveled all over the world before global pandemics.Would not think of not having it now. Insect Shield (r) another level of protection . Not just for camping either. General sleeping hygiene product. Sawyer makes a spray product for reapplication of insect shield at REI. Absolutely essential product. Pack mine with nice-smelling dryer sheet. Total nerd.
I got this for my son for Boyscouts instead of sending him with a much bulkier and heavier twin sheet set because we do so many hiking and camping trips where he carries his own weight. He used it on a 4-day trip where we hammock camped. To save weight, he packed only this liner, a small lightweight travel blanket that folds into about an 8” square pillow, and a sleeping pad for his sleeping system along with his hammock. The temperature dropped from about 80 degrees F to between 50-60 at night and he stayed perfectly comfortable. He liked the liner so much he used it in his bed at home and also took it on a week-long camping trip with the Boyscouts where they slept on cots. Both of us are very satisfied with the purchase. I’m so glad he’s not having to lug around a ... MoreI got this for my son for Boyscouts instead of sending him with a much bulkier and heavier twin sheet set because we do so many hiking and camping trips where he carries his own weight. He used it on a 4-day trip where we hammock camped. To save weight, he packed only this liner, a small lightweight travel blanket that folds into about an 8” square pillow, and a sleeping pad for his sleeping system along with his hammock. The temperature dropped from about 80 degrees F to between 50-60 at night and he stayed perfectly comfortable. He liked the liner so much he used it in his bed at home and also took it on a week-long camping trip with the Boyscouts where they slept on cots. Both of us are very satisfied with the purchase. I’m so glad he’s not having to lug around a ton of weight and also so he has a layer to keep his top-layer sleeping gear clean. The ability to layer is what you need for colder trips and this is a great addition to his gear!
I love to keep things as clean as possible. Not so easy with kids right? But the sleeping bag liner is a great start to the longevity of the sleeping bag. I love that they're stretchy and can provide an extra layer in the bag or even just when it's summer and you want the option to have a light covering with the sleeping bag unzipped.
This liner is very versatile, as it can be used as a sleeping bag liner, on it's own on warmer nights, or as a case/cover for your sleeping pad. The cotton feeling is a great. Because it's so versatile it should appeal to warm weather backpackers all the way to car campers.The quality is excellent and it should yield years of service, and remember that as a sleeping bag liner, it adds life to your sleeping bag by keeping it cleaner.
Recently got a double sleeping bag and thought a liner would be a great addition! Fabric is so soft and comfortable and on some of the warmer eves in the desert it's all you need. Such a treat to be able to snuggle with my person, and have enough space to move around too!
Preparing my kids to travel to Iceland and Switzerland this summer. We found out that their sensitive skin broke out in a rash when we were at a Disney resort so we looked into travel liners to use at hostels. So far, we have tested it out at home and on a recent camping trip and it has been a success. It is soft, it is comfortable, it even added warmth when a cold front went through our camp site.
The material of the expander travel liner is soft and comfortable, like a nice sheet. It is so stretchy, however, that it gets twisted around me when I sleep. It almost looks like it has been sewn a little crooked, but I think that is just the material. My biggest complaint is that the extra material for the pillow is not big enough to cover a standard size pillow. I don’t know if that is normal for sleeping bag liners but that doesn’t make sense to me, since it makes it non-functional as a cover for a pillow.
I own pretty much all of these, the thermal, silk, cool max and this. It’s the best. I spend half of my nights in this. It’s roomy and stretchy and unmatched in its comfort. It doesn’t weight much more than the others and is half the price.The cool max has its place in hotter climates but I use this for everything else. Bought three of these in case they ever stop making them.
Your can read the specs on the listing page. My thoughts...trying to decide what the best use of this item is. Sleeping bag liner to keep the bag clean (and possibly add a little (likely very little) warmth to your sleep system. Use as a travelling bag when sleeping in dodgy or not so dodgy hotels, hostels or sleeping over at friends. I have been comparing this to a summer grade bag such as a Marmot 45/55 degree bag around 900 gm which is heavier than this liner at 380 gm. Both are actually not far off being the same size as the Marmot bags are compressible and the liner comes in a mesh sack without compression. Deciding which is more versatile and useful. Perhaps the liner inside the Marmot is the answer I am seeking.
| Shape | Rectangular |
| Outer Material | Cotton |
| Season | All Seasons |
| Seal material type | Cotton |
| Is discontinued by manufacturer | No |
