Sabre Dog Attack Deterrent 22gr. dose (with key ring so it's always at hand/never forgotten) for my wife (as their's always the possibility of an aggressive dog showing up when out walking our friendly Lab) as it gives her piece of mind to protect not only our own dog, but herself as well.
For myself it would have to be your Personal Care Trauma Kit (I do not shoot anywhere w/o a first aid kit able to manage a gun shot wound) as it's small, yet packs enough good kit to save a life from a firearm inflicted wound/bleed...
and of course all your CCI .22 ammo. and Hornady centre-fire ammo., which are all I shoot, but now that you've gained my attention with these smoke grenades they may be my next new favourite item as they do look like they would be very entertaining yet safe to use...
Cheers D