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RolfSky 4.8K Views
Mar 29, 2024 4:17 PM

Klymit KSB 0°F Sleeping Bag - 650 Fill Power, Mummy - $99

$99

$190

47% off
SIERRA
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Found this (supposedly) 0°F sleeping bag on Sierra which has pretty good reviews on other sites. Picking it up for my son in scouting who claimed his bag wasn't warm enough and on his recent outing.

Looks like Klymit has a few versions of this bag — some hybrid which are down "on top" with poly underneath. This one I believe is just poly all the way around, which should be fine for car-camping and less worrisome to care for.

Free shipping with $89 order via promo in checkout

https://www.sierra.com/klymit-ksb...y~p~3jwyk/
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Found this (supposedly) 0°F sleeping bag on Sierra which has pretty good reviews on other sites. Picking it up for my son in scouting who claimed his bag wasn't warm enough and on his recent outing.

Looks like Klymit has a few versions of this bag — some hybrid which are down "on top" with poly underneath. This one I believe is just poly all the way around, which should be fine for car-camping and less worrisome to care for.

Free shipping with $89 order via promo in checkout

https://www.sierra.com/klymit-ksb...y~p~3jwyk/

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Mar 30, 2024 4:19 AM
3.2K Comments
Joined Oct 2008
majorhavocMar 30, 2024 4:19 AM
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Product specs say insulation material is polyester synthetic. Fill power indicates the relative quality of goose down, not any other kind of insulation. It's a measure of how much space (in cubic inches) one ounce of down occupies. The higher the number, the more loft per weight, and therefore more ability to insulate. One ounce of down that lofts to 650 cubic inches is 650 fill power.

I'm not understanding how any reputable manufacturer can claim a sleeping bag made with synthetic insulation can be "650 fill power". It certainly can't be that someone's invented a synthetic insulation as light as down. If that were the case, this Klymit 0 deg bag would weight a heck of a lot less than 4lbs, 11.5oz.

I call shenanigans.
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Mar 30, 2024 12:59 PM
49 Comments
Joined Jul 2021
Monkeyman110Mar 30, 2024 12:59 PM
49 Comments
Quote from majorhavoc View quoted comment :
Product specs say insulation material is polyester synthetic. Fill power indicates the relative quality of goose down, not any other kind of insulation. It's a measure of how much space (in cubic inches) one ounce of down occupies. The higher the number, the more loft per weight, and therefore more ability to insulate. One ounce of down that lofts to 650 cubic inches is 650 fill power.

I'm not understanding how any reputable manufacturer can claim a sleeping bag made with synthetic insulation can be "650 fill power". It certainly can't be that someone's invented a synthetic insulation as light as down. If that were the case, this Klymit 0 deg bag would weight a heck of a lot less than 4lbs, 11.5oz.

I call shenanigans.
Primaloft gold, one of the better synthetic insulations, has a full power of 550. The 650 rating they give this it is likely pushing it a bit. Now, 650 fill down is a low bar for technical gear. This is probably a nice bag for really rainy and humid conditions.

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