Sealline Sizing

What is the difference between "splash-proof," "watertight," and "waterproof"?

SealLine products use three ratings to describe water resistance:

  • Splash-proof: Withstands driving rain and light splashing.
  • Watertight: Withstands quick submersions and will float if dropped in the water. Most of our bags fall into this category and are suitable for canoe, kayak and rafting use where boats may tip, flip or be swamped.
  • Waterproof: Withstands 1 meter of submersion for 30 minutes (IP-67 standard). Suitable for extreme and prolonged wet situations (Zip Duffles) and also electronics which are expensive and tend to sink in water.

With any such bags, water resistance depends on the user carefully and properly sealing the closure. For dry bags and HP Map Cases, this means a minimum of three tight and wrinkle-free rolls. For E-cases, Map Cases and Zip Duffles the zipper must be completely closed.


What is the difference between urethane, coated nylon, and vinyl dry bags?

Our premium urethane-coated dry bags (Black Canyon™ & EcoSee™) offer significantly greater puncture and abrasion resistance than vinyl while also being lighter weight. For example, our Black Canyon Boundary bags weigh approximately 8-14 oz. less than vinyl Boundary™ bags. In addition, they are less harmful to the environment than vinyl.

Our nylon dry bags are also urethane-coated and offer the best strength-to-weight ratio in a dry bag. Nylon has a much lower coefficient of friction than vinyl, so they are easier to slide into tight spaces, such as kayak compartments. They also remain pliable in extremely cold temperatures.

Our vinyl dry bags are economical and resistant to punctures, tears, and mildew. They withstand cracking and remain pliable at low temperatures. We utilize vinyl on our Baja bags, as well as our Boundary Pack, Pro Pack, and Zip Duffle. We also use a transparent vinyl with our See Bags, so you can see what's packed inside.


What is special about the Dry Seal closure?

Our exclusive design provides the best closure performance of any roll-down dry bag. The bag is held tightly together between paired vinyl strips.


Are the bags measured rolled or unrolled?

The measurements are for rolled bags with the minimum three folds.


Why do Kodiak Window and Taper Bags have a watertight purge valve?

The Kodiak bags are primarily designed for sea kayaking and have low friction nylon fabric exteriors to help them slide into Kayak compartments. The purge valves let you eliminate excess air, either while rolling closed, or while in the boat compartment to save precious hull space.


Is the zipper on the Zip Duffle really waterproof?

Yes, the Zip Duffle is our most waterproof bag. It’s made with a four-coil YKK zipper that is the same kind used in dry suits. It is indeed waterproof (meets IP-67: 1 meter submersion for 30 minutes) and the zipper is protected from abrasion by a vinyl over-flap. The zipper runs diagonally across the top of the bag, providing quick and easy access.


What does the rating on the Electronic Cases mean?

Electronic Cases meet the International Electronics Commission’s (IP-67) standard for submersible electronics. The symbol guarantees that, when properly sealed, E-cases will protect your gear from getting wet under 1 meter of water for 30 minutes.

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