Handled garden tarp from Cool Tools . While the primary purpose is for gardening, these strike me as useful for many types of improvised hauling common in disasters. Not least dirt, sand and gravel for sandbags in floods.via Cool Tools: Burden Cloth.
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.