I picked this up, after doing a lot of research on the internet.  My intention was to make a "bus bag".  I work on an ambulance, and we carry a "jump bag" into every call.  this bag weighs about 30lbs, and is very cumbersome.  While I still have to bring it in, it's easier to carry this, with essentials in it.  I keep everything from bandage supplies, to a tube of glucose and band-aids.  Im still in a trial phase with this, but even if it doesn't work out I will still keep it stocked and use it for a first aid bag around my house or in my vehicle.  There is plenty of space in this bag to pack it full of supplies.  and comfortable to carry with, and wear on your shoulder.  My only suggestion would be to have a grab handle on top of the bag.  Picking it up without using the strap can be a bit awkward since there is no handle.  Overall great bag, many uses for this bag, there's no excuse not to own one!