is lowered the curved bottom 4 of the ashtray pushes it away from the window 9 and causes the velcro to disconnect this happens because the curved bottom 4 is pushed outward by the shape of the vehicle door 11 the rubber door waterproofing 10 is also shown in fig3 at the time the velcro separates the magnetic field from the magnet 8 causes an attractive force with the metal of the vehicle door 11 causing the cavity 1 to now attach to the door 11 when the window 9 is rolled back up the velcro re attaches and pulls the magnet 8 away from the metal door 11 causing the cavity 1 to again attach to the glass window for this reason it is important that the magnet 8 not be too large so that the velcro can pull the cavity away 0032 fig4 shows an alternate way of attaching the cavity 1 to a vehicle window 9 with a semi rigid hook 5 this hook can be metal or plastic with this embodiment of the invention the window normally is not opened all the way the hook 5 can be made thin enough to allow the window to totally close the hook 5 can be of a fixed shape as shown in fig4 or it can be in the form of a spring that provides tension against the window another alternate embodiment of the present invention can be a variation where the cavity is mounted to a sun screen or window sun visor it will be appreciated that the shape of the ashtray does not have to be rectangular but can assume any convenient shape in addition an embodiment.