I carry smoke and aerial flares in my PSK and SAR bag. I buy them from Wal-Mart in the boating area or at the boating/marine shop in town. Beware white/grey smoke it can easily be mistaken for fog, haze, etc. Red is a good contrast anywhere, most boat stuff is red. These chain-pull activated smoke pots are small, about the size of a 35mm film can and come in a 2 pack for about $15.00. The aerial flares are 1x6 inches, come in 3 pack and are $ 21.00-pk. If you need some SMOKE then find shomer-tec they sell true mil-spec Smoke grenades for about $35.00 ea. with a pleasing choice of colors (purple is my favorite).