Will, Good gear reviews.
Since the first iteration of the Murmur '12, Gossamer Gear revamped the straps on the pack. It now has poly straps instead of the nylon which would slip if the pack was overloaded. 5-6 days is a very conservative estimate for a trip with the Murmur. I have had two food bags in it and a small compression bag for the sleeping bag & cloths. I took this for about 2 weeks over the Northville-Placid Trail at about 23 pounds total pack weight at the trail head. Food, of corse, was the single bigest weight at about 16-17 pounds. The small pack is certainly capable of longer than 5-6 days.
The Steripen can be difficult to recharge in the ADK's. I prefer the battery operated Opti. A little heavier, it lasts much longer in the back country.