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Plasma 30 Sleeping Bag: 30F Down

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Whew, there it is.

Don’t panic—you didn’t forget to pack a sleeping bag. The Marmot Plasma 30 Sleeping Bag is just so compact and lightweight that it may feel like you left it at home. It's not designed for Arctic expeditions, but for summer and moderate shoulder-season trips; its super-high-loft 875-fill down will keep you plenty warm without slowing you down or taking up space in your pack. The insulation's also been treated with Down Defender to improve its water-resistance, and the tough-but-ultralight Pertex Quantum shell has internal and external DWR coatings as well, to shed water and keep your down as fluffy as the day you bought it.

It would be tough to make a bag with a traditional design this light, but the Plasma uses Insotect Flow vertical baffles, which help direct heat to the wrap-around footbox, keeping your toes warm without the need for extra down. Leaking and drafts are minimized, too, with help from the insulated draft tube, collar, and face muff, so you don't have to deal with cold air sneaking into your bag and ruining your night.


  • 30-degree rating
  • 875-fill goose down with Down Defender water-resistant treatment
  • Mummy bag with Insotect Flow vertical baffles
  • 10D Pertex Quantum nylon ripstop fabric
  • Ultralight
  • Drawcord hood with insulated collar and draft tube
  • Wrap-around footbox construction
  • Two-way zippers with garage
  • Hang loops
  • Item #MAR003F
Pertex Quantum (10D nylon ripstop), DWR coating
875+ fill goose down
Max User Height
[regular] 6 ft, [long] 6 ft 6 in
Shoulder Circumference
[regular] 60 in, [long] 62 in
Hip Circumference
[regular] 58 in, [long] 60 in
Foot Circumference
[regular] 43 in, [long] 46 in
Bag Length
[regular] 83 in, [long] 90 in
Fill Weight
[regular] 10.41 oz, [long] 11.82 oz
30 F
European Norm Comfort Rating
42.4 F
European Norm Lower Limit Rating
33.6 F
Stuff Sack
Stuff Size
7 x 15 in
Claimed Weight
[regular] 1 lb 6.44 oz, [long] 1 lb 7.86 oz
Recommended Use
camping, backpacking
Manufacturer Warranty