I assemebled a Pocket Urban Survival Kit before, from a 2oz tin, but I found it too bulky to carry everyday. It had duct tape, a swiss army classic, waterproof paper and penicl, mini bic, intant cloth pills, B12 vitamins, matches, purification tablets, water bag, whistle, foil, P-38, and razor blades.

Instead, I have a AMK Adventure First Aid 1.0 with,
Water purification tablets
Aluminum foil
Sewing kit
Safety pins
Water bag
Instant cloth pills
Along with assorted first aid items for treating minor injuries.

Survival Keychain,
House key
Pill fob with cotton tinder
Slim Rescue Howler
Streamlight Nano Light
P-38 can opener

In my jacket,
Gerber STL 2.0
Red Bic Mini (removed safety)
Duct tape (wrapped around cut down pen tube)
25ft of Paracord
AMK Heatsheets blanket

I figure these items, though not in a single survival kit, make a good urban/suburban system.

Hope this helps somewhat!