What Is Dry Bag
Like its name suggests, dry bags are waterproof bags designed to keep your things dry. Whether you are an outside fanatic or just somebody who life in the rainy city, dry bags are a vital tool to protect your possessions from getting wet from unpredictable factors. Dry bags are an assurance and will ensure your ease of thoughts. See also Best Dry Bag for Kayaking

There are, nonetheless, many bags on the market nowadays that assert to become waterproof when they're merely water repellent or water resistant.

Dry bags are generally made from Vinyl or Thermoplastic Polyurethane (TPU) coated materials such as Nylon or Polyester. The plastic coating can make the fabric fully waterproof and may not be penetrated by water. The luggage are then made with ultrasonic welded seams and are fitted with waterproof zippers. Since there isn't any needle or zipper holes, the bags are entirely waterproof and not just water resistant. Furthermore, the roll-top closure, where the opening folds more than on by itself two or more times, keeps the bags air and watertight.

Remember, if there are stitched holes where the body panels satisfy, it is not waterproof!