I've had this jacket for a few years and it has served wonderfully, and will undoubtedly stay with me a few more years. It is fairly water resistant, keeping me dry as long as I'm not hiking in the rain. I can never feel any wind through it no matter how cold and hard it blows. And while it's definitely not as warm as a down jacket, it keeps me warm with just a t-shirt underneath down to below freezing.

its just wrong specs. brunton says its 1.6 ounces (45g). Butane might be lighter than air, if it was at standard temp/pressure, but its compressed and therefore heavier.

I find it very easy to pump up my pad with this pump. it is a little tricky to keep it open while you start to roll the top, but it's manageable. Also, when i bought this, i was afraid that the air would just blow back out since you cant get to the valve while the sack is one there, but it turned out that air hardly escapes anyway until that very last pump, and by then, your taking the sack off anyway. After that, it's one or two blows from your mouth to really firm it up and your set for a comfy night of sleep. My only (minor) dislike about this sack is that my BA Insulated Air Core 20x78 pad wont fit in it horizontally. but thats really not too big a deal.

I really like the material, and the design is top notch, but there's not a zippered pocket. I know it says there is, but not on mine. I guess it was just a typo by backcountry, but I would have liked a zippered pocket. Also, I'm a size 33 and went for the 34, but I should have gotten the 32 because the material around the waist is just elastic covering the belt and it would have easily fit me without the larger size.

this thing works perfectly. And it doesn't say it on this site, but you can take the bladder out of the insulated sleeve. it's just a regular Omega Hydrotanium bladder, which makes this a GREAT value considering you get the sleeve and the Ergo Hydrolock mouthpiece for only 5 dollars more than the bladder by itself.

just got this. haven't had a chance to use it on the trail yet, but i've slept in my room and it's great. pros: stuffs very small (slightly larger than a nalgene), very comfortable (elastic system works), and while i'm not sure yet, i feel like i could use it down to its rating. cons: its purple, it looks blue on the website, but its one of those purpleish blues.