This is what I just bought to build a 1st aid kit. Compact and everything is visible. It's a Blackhawk Medic Roll.
It looks like a pretty good idea, just don't stuff it with crap like the photo shows
I am using a Ferno bag I purchased after my first First Responder course I took in 2006 or there abouts.I stuffed about 50 4by4's into it,about 10 rolls of tape,good scissors,hemostats,2 really decent pairs of tweezers, a few battle order dressings (pressure dressings),4 litres of saline in 1 litre bottles, about 20 pairs of gloves and a pile of knuckle and fingertip dressings (just going by my personal experiences
).Of course the steth and bp cuff go without saying.
I keep meds in a cool dry place (vacumn sealed in the cooler) but really, I mostly end up dealing with road rash or big bloody messes.For everthing else, I call in medevac and wait for the sartechs to show up!