Dry Bag

Definition: A dry bag is a watertight bag or case specifically designed to keep equipment or documents dry in a wet environment, such as during scuba diving or other water-based activities.


Scuba diving is an exciting and adventurous water sport that allows participants to explore the underwater world. However, diving often requires carrying essential equipment or personal belongings that need to be protected from water damage. Dry bags provide a simple and effective solution to this problem, ensuring that divers can keep their valuables dry while they are submerged in water.

Materials and Construction:

Dry bags are typically made from waterproof materials such as PVC (polyvinyl chloride), TPU (thermoplastic polyurethane), or nylon with a polyurethane coating. These materials are highly resistant to water penetration and can withstand the harsh conditions of marine environments. The seams of a dry bag are sealed using welding or high-frequency bonding techniques, which create a watertight barrier between the bag’s interior and the external environment.

Sizes and Shapes:

Dry bags come in various sizes, ranging from small pouches for smartphones and wallets to large bags capable of holding a full set of diving gear. The size of the bag should be determined based on the specific equipment or items that need to be protected. Divers may opt for a single large dry bag to store all their belongings, or they may choose multiple smaller bags to separate different items and improve organization. In addition to size, dry bags come in various shapes, including cylindrical, rectangular, and backpack-style designs, allowing divers to choose a bag that best suits their needs.

Closure Mechanisms:

The closure mechanism is a crucial aspect of a dry bag’s design, as it ensures that the bag remains sealed and watertight during use. There are several common closure systems used in dry bags:

  1. Roll-top closure: This is the most common closure method, featuring a stiff plastic or rubber strip at the top of the bag. To seal the bag, the top is folded or rolled several times, compressing the air inside and creating a watertight seal. The rolled top is then secured using a buckle or strap system.
  2. Zip-lock closure: This type of closure consists of a plastic zip-lock seal, similar to those found on resealable food storage bags. The zip-lock mechanism provides a watertight seal when properly closed, and it allows for quick and easy access to the bag’s contents.
  3. Waterproof zipper closure: Some dry bags use waterproof zippers as their closure method. These zippers have a rubberized or coated surface that prevents water penetration, ensuring that the bag remains watertight when properly closed.

Usage and Care:

Proper usage and care of dry bags are essential to ensure their continued effectiveness and longevity. Here are some tips for using and maintaining a dry bag:

  1. Test the bag’s watertightness before use: Before placing valuable items in a dry bag, it’s a good idea to test its watertightness. Fill the bag with air, seal it, and submerge it in water. If air bubbles escape or water enters the bag, there may be a leak in the material or closure system that needs to be addressed.
  2. Pack items carefully: Avoid overfilling the dry bag, as this can strain the seams and potentially cause leaks. Distribute weight evenly and avoid placing sharp objects inside the bag, as they could puncture the material.
  3. Keep the closure area clean: Dirt, sand, or debris in the closure area can compromise the watertight seal of the bag. Be sure to clean the closure area thoroughly before sealing the bag.
  4. Rinse and dry after use: After each use, rinse the dry bag with fresh water to remove salt, sand, or

other debris. Allow the bag to air dry completely, both inside and out, before storing it away. Regular cleaning and drying will help prevent the growth of mold or mildew and extend the life of the bag.

  1. Inspect the bag regularly: Periodically inspect the bag for signs of wear, such as cracks, punctures, or seam separation. Address any issues promptly to maintain the bag’s watertight integrity.
  2. Store properly: When not in use, store the dry bag in a cool, dry place away from direct sunlight. Prolonged exposure to sunlight can cause the materials to degrade over time, reducing the bag’s effectiveness and durability.

Accessories and Additional Features:

Some dry bags come with additional features or accessories to enhance their functionality and convenience for divers. These may include:

  1. Transparent windows: Certain dry bags have transparent windows or panels that allow users to see the contents of the bag without opening it. This feature can be particularly useful when trying to locate a specific item quickly.
  2. Internal compartments or pockets: Some dry bags have built-in compartments or pockets to help organize and separate items within the bag. These can be especially useful for keeping smaller items secure and easily accessible.
  3. D-rings or attachment points: Many dry bags include D-rings or other attachment points that allow them to be secured to a boat, kayak, or diving gear. This can be useful for keeping the bag in a fixed position during water-based activities.
  4. Shoulder straps or backpack-style designs: For increased comfort and ease of transport, some dry bags come with adjustable shoulder straps or are designed to be worn as a backpack. This can be particularly useful for divers who need to carry their dry bag over long distances or during hikes to remote dive sites.


A dry bag is an essential piece of equipment for scuba divers and other water sports enthusiasts, offering a reliable and practical solution for keeping belongings safe and dry in wet environments. With a variety of sizes, shapes, materials, and closure systems available, divers can choose a dry bag that best suits their specific needs and preferences. Proper use and care of a dry bag will ensure its effectiveness and longevity, making it a valuable investment for those who frequently engage in water-based activities.