Here, for what its worth, is the kit that lives in my car. A basic first aid kit purchased at Canadian Tire and supplemented a bit with some extra supplies. It's really meant for common minor injuries, with basic treatment of more serious injuries (hopefully) covered.
Contents:
1 225ml Hydrogen Peroxide
1 100ml Rubbing Alcohol
1 25g First Aid Cream(cetrimide BP)
1 Large instant cold pack/compress
2 small instant cold pack/compresses
1 100ml container, loose ibuprofin
1 disposable CPR face shield
1 disposable CPR face shield with breathing tube
1 pair paramedic shears
4 pairs non-latex, non powdered gloves
2 pairs latex powdered gloves
1 roll 1/2" medical tape (10 yards)
1 roll 1" transpore medical tape
1 tenser bandage with clips
2 rolls gauze
1 40x40x56 triangular bandage
4 5x9" abdoninal pads
2 4x4" gauze pads (sterile)
2 Spenco 2nd skin burn pad
1 eye pad (sterile)
3 3x3" gauze pads (sterile)
5 2x2" gauze pads (sterile)
1 No.4 presssure bandage (sterile)
4 3" cotton tipped applicators (sterile)
8 1x2" "bandaids"
36 standard "bandaids"
10 butterfly bandaids
10 sting relief medicated pads
13 alcohol prep pads
30 antiseptic towelettes (Benzalkonium chloride 0.4%)
Supplies likely need to be "topped up" as its seen some use at work for minor scrapes, cuts and so forth.

