What precautions should I follow before packing my GPS/camera/cell phone in a dry sack/TPU Accessory Case?
Be aware that no roll-top dry sack (regardless of manufacturer) is waterproof enough for problem-free storage of sensitive electronic devices. A very small amount of moisture is sufficient to permanently damage or destroy electronics.
If you are going to take electronic devices into very wet environments, double-bag the device: pack it into one dry sack, roll and click the roll-top closure, then pack this into a second (larger) dry sack, and roll and click this closure.
Make sure that the outer dry sack is robust enough for use in a paddling environment. We do not recommend our featherweight UltraSil Dry Sacks, UltraSil View Dry Sacks or Nano Dry Sacks for river or ocean use.
Also be aware that condensation can form inside a waterproof enclosure. If you are using a dry sack, the air which will be trapped inside it when you seal the roll-top closure will contain moisture vapor. If the dry sack is then exposed to a cooler environment (which is often the case on the water) this moisture will condense inside the dry sack – i.e. it will turn back into liquid moisture. Therefore, it’s a good idea to pack a desiccant (such as the silica gel packs which come in the original packaging with electronics) into the dry sack. This tip applies to other forms of waterproof enclosures including hard-shell cases.
If you are looking for a simple, lightweight, flexible storage system for electronics which is submersible, we would recommend the TPU Accessory Cases / TPU Waterproof Cases for iPhones and SmartPhones / TPU Waterproof Cases for Tablets. All of these products use a triple fold/double-Velcro closure, and the slightly ‘tacky’ TPU film sticks to itself creating a simple watertight seal. The Case for iPhone/Smartphones and the Cases for Tablets also have an additional ziploc® closure for extra protection. Properly sealed, all of the TPU products are waterproof enough for boating use – they are tested to 10 meters of submersion for one hour, earning an IPX8 rating; and away from the testing laboratory, the closure does not ‘pop open’ in real-world use.
As waterproof as the TPU products are, the above caution regarding condensation still applies.