I've managed to get my gear down to a 9 liter waterproof ruck, a water resistent belt pouch and US issue canteen w/cup, pouch and chemical water treatment. Around 13# or just over 1 stone including water. Well, that plus my Victorinox SAK w/saw and firesteel, as well as my leatherman that I carry on my belt. My main ruck (avatar) is almost 3 times the volume of this ruck, but this is the one I'll have with me when and if I get stranded while out and about in the truck.
Gear in the ruck and pouch are as follows.
1x US issue poncho
1x Smartwool socks
1x Thermal longsleeved shirt
1x Esbit stove w/6 fuel tabs
1x USAF survival knife w/minikit in Blackhawk sheath pouch and paracord wrapped handle.
1x Small food kit
2x Heavy Duty 55 gallon industrial drum liners.
1x Notepad and pencil
1x First Aid Kit
1x Fishing/sewing kit
1x Bug juice towelettes (12)
1x Emergency candle
4x Pitchwitch firestarter
1x space blanket
1x TP (toilet roll)
1x Small burlap bag with carry handles (water carry)
1x 1 gallon ziploc freezer bag (water carry)
1x Spark-lite aviators firestarting kit w/extra tinder
1x Minimag flashlight
1x 15 meters parachute cord
All life is subject to the laws of Nature, or to be more precise, the laws of our CREATOR.