My murphy bag contains a lightweight first aid kit (4.6 oz.) and a emergency gear repair kit listed below (4.0 oz).
I store both kits in a small stuff sack which I tuck into the bottom of my pack under my sleeping bag to keep it out of the way. The contents of my emergency gear repair kit include lots of different kinds of fasteners, extra batteries for my camera and LED lights, water purification tablets, emergency matches and 1 spare shoe lace.
From experience, this is the stuff that will let me last about 1 day on an East Coast US trail before I could come across someone who can help me or I can get to a road for a ride and do a resupply. Not all of the contents are life and death, but some of them like the matches, duct tape and water purifier tabs are very important.
|Spare Boot Lace||6|
|10' Roll of Duct Tape||38|
|2 Lithium AA Batteries||30|
|2 CR2032 Batteries||6|
|REI Emergency Matches in WP Bottle||18|
|6 Aqua Mira Water Purification Tablets||2|
|6 Plastic Cable Ties||4|
|6 Rubber Bands||4|
|4 Safety Pins||4|
|Needle and Thread||1|
|total weight in oz.||4|
One of the most useful components in this kit are the plastic cable ties. They provide an exceptionally strong way to connect two pieces of gear together. I refill this one component the most often because my friends are always asking me for them!