Being concerned about pack weight is a good thing. I have been working steadfastly for last month trying to get my pack weight down. I have tested every item in my pack. I routinely walk for 8 to 14 miles carrying my entire pack load. I'm walking the camino same time period, flying from the US on Sept 25th and start walking at Roncesvalles on the 26 or 27th. I walked from LePuy to Roncesvalles fall of 2012, same time period, thus completely this year. In france all you need is silk liner but my one night in Spain, taught me a sleeping bag of some sort is required for my comfort. Last year I carried about 12#. This year I've got my pack weight down from16# to about 12 # before consumables.... water, supplements, toiletries. It has been a chore. For my sleep system I will be taking a flat silk sheet 4.5 oz that I made large enough to tuck in all around a twin bed along with a Montbell down quilt, 13 oz, rated 50 degrees. I have tried many options, including the REI sleep sack 1 # 10 oz... too heavy, don't like sleeping inside something where I can't fully unzip it. A silk rectangular shaped sleep sack 4.4 oz with a breathable heat reflective blanket 11 oz made by cutting zipper and side seam out of SOL breathable bivy which is actually a very functional system. I scrapped that one only because I hate crawling in and out of silk bag. When all is said and done I will be carrying less than 10% of my body weight. Still have 3 weeks to fine tune. I'm not taking either wool or caprilene leggings though both were in my original options. I'm not taking my ultra light, 8 0z down jacket. I am taking 2 pair long pants, 1 skirt, 1 dress, 1 wool zip neck top, 1 long sleeve sun protection shirt, 1 light wind breaker hooded jacket, 2 tanks, 2 T's, 1 caprilene short, 1 Patagonia R1 hoody, 1 insulted vest 5 oz, 1 rain poncho 10 oz, 4 pair Darn Tough socks, 3 undies, 2 bras. Seems like a lot but take away what I'll be wearing which will change with conditions my clothing weight is about 5#. All my clothing sizes are L womens, makes a difference. Hope this helps.