The Anatomy of a Wet Bag
Before diving into the why of open storage, it helps to understand what makes a wet bag work. These bags are typically made from a polyester fabric that is bonded to a thin layer of polyurethane laminate, or PUL. This waterproof layer is what miraculously
keeps moisture and odors contained, preventing a wet swimsuit or dirty diaper from soiling everything else in your tote. This design is brilliant for transport, but the very features that make it so effective—being waterproof and airtight when sealed—are what can cause problems once you get home if not handled correctly. The goal is to contain the mess temporarily, not create a permanent habitat for unwanted microbes.
The Dangers of a Zipped-Shut Wet Bag
Zipping up a damp wet bag and tossing it in a closet or car trunk is a recipe for disaster. A dark, warm, and moist environment with no airflow is the perfect breeding ground for mold, mildew, and odor-causing bacteria. These fungi not only create unpleasant, musty smells that are difficult to remove but can also pose health concerns, especially for those with allergies or respiratory issues. Beyond the smell, this trapped moisture can cause significant damage to the bag itself. The constant dampness can lead to the PUL layer separating from the fabric—a process called delamination—which destroys the bag's waterproof properties and effectively ruins it. You might also notice a buildup of ammonia smells, particularly if using the bag for diapers, which becomes much harder to wash out.
Best Practices for Storing and Drying
The rule is simple: a wet bag must be allowed to air out and dry completely between uses. After emptying the contents, the first step is to turn the bag inside out. This exposes the waterproof PUL lining directly to the air, which is crucial for thorough drying. Hang the bag in a well-ventilated area. Good options include a hook in the laundry room, over a shower rod, or on a drying rack. Ensure there is good air circulation to speed up the process and prevent any lingering moisture. Never store a damp bag in a confined space like a drawer, a closed hamper, or the trunk of your car. By allowing it to air dry completely, you prolong its lifespan and ensure it stays fresh and functional.
Washing and Deep Cleaning Your Bags
Regular washing is just as important as proper drying. Most wet bags can be machine washed right along with your regular laundry or, if used for diapers, with a load of diapers. It’s generally recommended to wash them every 2-3 days to prevent bacteria from setting in. Always use a mild detergent and avoid fabric softeners or bleach, as these harsh chemicals can degrade the waterproof lining. High heat is the enemy of PUL, so opt for a warm or cold wash cycle and always hang the bag to dry. Putting a wet bag in the dryer can cause the laminate to crack, bubble, or delaminate, so air drying is the safest method.
Troubleshooting Lingering Odors
Even with the best care, you might occasionally notice a stubborn smell. If your wet bag develops a musty or unpleasant odor, there are a few things you can try. A deep clean can often solve the problem. One effective method is to soak the bag in a diluted solution of white vinegar and water, which helps neutralize odors without using harsh chemicals. After soaking, wash it as usual and ensure it dries completely, preferably in a sunny spot, as sunlight is a natural bacteria killer (but don't leave it out for too long, as excessive heat can still be damaging). For persistent smells, placing a small open container of baking soda or activated charcoal inside the dry bag can also help absorb lingering odors.
