Pocketsize Clear Vinyl Pouch 4 x 5 inches (10.2 x 12.7 cm), 4 x 3.25 inches (10.2 x 8.3 cm) with top folded over, waterproof zip-top closure, lanyard hole, it really does fit in your pocket. Weight: 3.9 oz (111 g) You will barely know it is there until you need it to save your life.