The mug is a nice (standard) size and holds temperatures well. I'm not new to dual wall designs. I have a lot of dual wall stainless steel mugs that I use at home and they are awesome. There are two problems with this mug though, that could be improved upon. First, the titanium is extremely thin. I dropped the mug from about 3 feet on my kitchen floor and it dented the bottom edge. I think it should handle at least a minimal amount of abuse since it's made for outdoor use. I'd hate to see how it looks after years of use. Second, the handles are awkward and feel uncomfortable at times. Maybe if they clipped into each other and wouldn't move around it would be a little better. Otherwise, this mug does what it's supposed to.

Well, I just got the sack today and was looking forward to testing it out with my tent and sleeping bag. As soon as I pulled on the first strap it popped right off the sack. It looks like it was never stitched on like the other three straps (with two double duty seams). This may have very likely been an oversight and not caught by quality control, but in my book that's unacceptable. So, I decided to return it and go with granite gear instead. The one thing I did not like the sack(if it would have been in perfect condition), is that there seems to be a section above the compression straps that doesn't get compressed. It's a strange design to have that extra space (some used for rolling up the top) and not being able to compress it.