Gear & Kit
Dry Bags, Dry Suits And Why Water Still Gets In
Waterproof containers and garments fail at their closures, seams and seals rather than through their fabric, which is why technique and maintenance decide whether anything stays dry.
Waterproof kit rarely fails through the middle of the material. It fails where two things meet, and almost all of those failures are preventable by the user.
The roll top is a mechanism
A dry bag seals by folding the mouth over itself several times, so that water pressing in has to pass through a compressed labyrinth of fabric layers.
Fewer folds means a shorter path. A bag rolled once and clipped looks closed and leaks steadily, which is the single most common reason kit arrives wet.
Overfilling causes the same result by preventing the mouth from folding flat. A dry bag needs air space at the top to seal, which means packing it well below capacity.
Seams and welds carry the load
Waterproof fabric is joined by stitching, welding or taping. Stitching makes holes, so stitched seams need tape or sealant over them to stay waterproof.
Tape lifts with age, flexing and heat. A garment that has started to leak along seam lines has usually reached the end of its practical waterproof life.
Welded seams avoid the holes but concentrate stress at the weld edge. Repeated folding in the same place eventually cracks the material there, which is why storage matters.
Gaskets are consumable
Dry suits seal at the neck and wrists with elastic gaskets, usually latex or a synthetic equivalent, that must stretch tightly against skin.
Latex perishes with ultraviolet, ozone, oils and sunscreen. It hardens, then splits, and a split gasket lets water into the suit at a rate that changes the situation immediately.
Gaskets are treated as replaceable items on a schedule rather than as permanent parts, and they are inspected before trips where immersion is likely rather than after.
Zips are the expensive point of failure
Waterproof zips seal by compressing a moulded rubber tape between the teeth. Grit in the teeth prevents that compression and creates a permanent leak path.
They need rinsing with fresh water and lubricating with the product the manufacturer specifies. Salt crystals inside a zip do the same damage as sand.
Forcing a stiff zip is what breaks it outright. The correct response to resistance is cleaning, not more force, and a failed zip usually means a workshop repair.
Redundancy is the actual strategy
Because every seal has a failure mode, people who depend on dry kit rarely trust one layer. Sleeping insulation and spare clothing typically go inside a second bag.
Critical small items go in separate small containers, so a single failure does not soak everything at once.
On any trip where immersion is a real possibility, the consequences of wet insulation are what dictate this, and local knowledge of water and air temperature should inform how much redundancy is warranted.
