I have an older model (05) that I used on my 06 AT hike. I cannot say enough on how great it performs. At that time I think it was a 900 fill not an 850. I heard Marmot was changing it to an 850 fill due to the difficulty of obtaining enough 900 fill. More importantly, it was my understanding that the shell of the bag had an upgrade option of being more water resistant then the 05 bags. The only two times the bag posed a problem was when it got wet in the shelter due once to a water bottle breaking in the rack above me and once to a trail dog wanting to get warm on a very rainy night. Is the current shell of the bag the one with the more water resistant option then the older bags? For the longer trails, trust me, every bit of water resistancy will help.

Tech Specs:

Material:

[shell] Pertex Microlight mini ripstop, DWR coating; [lining] polyester mini ripstop (100% recycled, 20D), DWR coating 

Insulation:

850+ fill down 

Shape:

mummy 

Draft Collar:

no, draft tube 

Max User Height:

(regular) 6 ft, (long) 6 ft 6 in 

Shoulder Circumference:

(regular) 62 in, (long) 64 in 

Hip Circumference:

(regular) 58 in, (long) 60 in 

Foot Circumference:

(regular) 40 in, (long) 42 in 

Stuff Size:

12 x 6 x 6 in 

Stuff Sack:

yes 

Storage Sack:

yes 

Degree:

30 F 

European Norm Comfort Rating:

39.2 F 

European Norm Lower Limit Rating:

29.8 F 

Weight:

(regular) 1 lb 9 oz, (long) 1 lb 12 oz 

Recommended Use:

summer camping 

Manufacturer Warranty:

lifetime