A shemagh scarf, also known as a keffiyeh, is like a much larger bandana and, as a result, it has much farther-reaching utility. Here are 5 of the top survival uses of a shemagh scarf. As a Water Pre-Filter Fold up your shemagh scarf a few times, then lay it over the top of the vessel in which you intend to collect water. Pour the water over it, and as it passes through the shemagh, the scarf...