ok so lets say yo have a spare key zip tied under your vehicle
your at the beach,swimming and catching some sun.
ahhhh a beautiful day.
oh crap your late meeting the wife and you rush back to the car
only to find out you lockedx your keys in,damn
oh ya thats right i have a spare key under my car held there with a plastic tie strap
well thats great news i do have spare,but shit what do i use to cut the tie strap
my pocket knife is laying on the center console right next to my keys and cell phone.
ive seen alot of people hide keys under their vehicle, over the years of working in garrages
i still think the best way is keyless entry keypad
yes i know not all cars have them,but any car that has a FOB for the door locks can have an after markey one installed
for other cars i recomend a piece of "industrial grade" duct tape.clean a portion of the under/back side of either bumper
put the key on the sticky side of the tape,the press the tape onto the cleaned area of the backside of the bumper
no need to worry about how ya gona cut that damned tie strap this way