Coleman 40 degree Sleeping Bag

I picked this bag up to use as a summer sleeping bag in Northern Michigan and it should be good for that. It's definitely too warm for me above 65 degrees Fahrenheit that's for sure. I'll update soon on how well it performs at 40F as it warms up here in Michigan.Size: The size appears to be as stated. It's definitely 39" wide. I haven't measured the length, but it easily reaches my face and I'm 6ft 4in tall. The girth(width/circumference) fits me fine(I have a 56" chest FYI)Construction: This appears to be the only downfall of this bag. The stuff sack(if you can call it that) is flimsy/thin but you can fit the sleeping bag back in it fine as long as you make sure to squish all the air out of the insulation and get it compact as possible. Now the sleeping bag could use some better stitching along the seams. Mine has a spot that was doubled over and looks quite sloppy. It probably slipped through quality control and there probably aren't any more problems like that. The insulation seems to be fairly evenly distributed except at the foot box where it seemed a bit light. I'm not too concerned as I'm using this for a summer bag and nothing below 40F anyhow. The liner is a brushed polyester and is annoying as hell to me as it catches and snags easily on any rough surface(toe nails or even rough/callused skin - wearing socks could counter this I suppose)Other thoughts: It compacts fairly small for the large dimensions(it is only a warm weather bag after all) and doesn't weigh down my pack much more at all than a regular size bag of comparable temperature rating.Would I buy this again? Yes. It's about the cheapest Big & Tall size bag out there. For the money it's not bad. You can find much better quality bags but I needed something LIGHTWEIGHT & FIT in my backpack's sleeping bag compartment. Try that with the heavier cotton lined/cover bags or even the heavy weight cotton duck/canvas type bags! They're just huge and bulky no matter what AND weigh a TON. Coleman/Amazon offer a few other bags in a slightly lower temperature range with a cotton flannel lining which I think would be a little more comfortable than this but they add a bit of weight too(not to mention unneeded warmth for the summer months). If all else fails with this bag, I can always send it back to Coleman under the 5yr warranty(return shipping costs don't concern me as I get an industry discount but others will want to think about this before purchase)UPDATE: 3/23/2010: I have been trying this out on my screened in porch a few nights now in the 40's and 50's. You can make it through a night in the mid 40's only if you have a well insulated sleeping pad and are wearing a good layer of insulating clothing(socks,long johns/thermal top, and a light cap). I was on the chilly side but didn't use an insulated pad(my porch is raised about 2 feet of the ground and only has plywood and outdoor carpet to sleep on) and was only wearing boxer shorts to bed. With a nice insulating layer and a sleeping pad you can go down into the 40's without much of a problem. However, if you plan to regularly camp in the 40's you should obviously get a warmer bag. Sleeping bag ratings are always based on using a sleeping pad and what temperature you can sleep in without losing too much of your core temperature, not "how warm you perceive it". Your bag should always be 15-30 degrees warmer than your intended temperature for those "cold snaps". Remember, it's always easier to regulate your bag temperature if you're too warm...not so easy to warm up your bag if you're too cold.