Well I was all set to purchase the Kelty Light Year +20 bag from REI this morning, however I have just discovered that the third bag that I was considering; the Kelty Light Year XP zero degree bag is now on sale at $120 bucks from REI. This is a saving of $60 over the +20 bag and $70 over the Snowshoe, the other bag on my list.

However, the XP weighs in at 1 lbs. 5oz heavier than the 20 degree bag and compresses considerably larger also. Compared to the Snowshoe, the difference is marginal: 3oz heavier and 1/2 an inch wider.

Is a 3lb. 11oz, 10x18 sleeping bag too much to backpack or do you believe that the additional weight and size is worth the considerable monetary savings? $60-70 bucks is like a having a "free" cookset & stove or a water filter and if I didn't already have one, it would be almost half towards a backpack.

What are your opinions?