skog bands: heavy duty rubber bands made from epdm rubber - 5col survival supply (big mix) 5col survival supply "skog" is the norwegian word for "forest", and at 5col survival supply we feel like that's a great name for a heavy duty rubber band originally intended for hard use in rugged wilderness environments. skog bands are extra tough and ideal for any application where strength and durability are critical, whether that's a soldier's field, a commercial kitchen, or anything in between.