Seattle Sports Omni Dry Bag Small measures 15 by 7.5 inches (H x D); Medium measures 18 by 9.5 inches (H x D); Large measures 24 by 11.5 inches (H x D); Extra-large measures 28 by 12.5 inches (H x D) All-purpose bag Waterproof 3-roll closure Durable vinyl body Heavy-duty abrasion-resistant bottom