The domke f 2 ruggedwear shoulder bag is constructed from a high quality weather resistant durable cotton canvas that is treated with special non solvent environmentally friendly waxes that give the fabric a lifelong resistance to inclement weather the special formula allows the fabric to breathe while the waxes produce a unique distressed and weathered look right from the start the domke f2 bag is the bag that started it all jim domke had the first one custom made for his own use in 1976