With the Toshi Sling 5L, we made a deliberate choice to forgo an exterior PU coating on the fabric and zippers, which is often used to enhance water resistance. While this type of coating can help repel water, it tends to crack and peel over time, especially in hot and humid climates.
To give users more control over water resistance, we opted for a fabric with a PU coating only on the inner side, combined with zippers treated with a durable water repellent spray instead of a PU coating. This approach provides effective water resistance while allowing users to refresh the bag’s repellency as needed.
This week, we’ll walk you through one of our preferred methods to maintain and boost water resistance, using the Toshi Sling 5L as a demonstration.