Used waterproof bag set of L and S sizes. I used it a few times for swimming at the gym. It's not completely waterproof because it has seams. It worked well enough to keep things dry if you squeezed out excess water. It's large, so it's convenient to fit a bath towel and swimsuit in one bag. Made of laminated polyester. The following is the website description: Each bag has two pockets, allowing you to store dry and wet items separately. Sizes: 33x42CM (L) 29x22CM (S) Laminated material is stain-resistant and easy to clean! It's a reusable wet bag that can be washed in the washing machine. Each bag has two pockets, allowing you to store dry and wet items separately. It holds odors and moisture from clothes changes and diapers, and you can easily wash it at home after bringing it back. It has a snap handle, which is convenient for hanging on strollers, car seats, or towel bars. Great for outings! Perfect for storing diapers, changes of clothes, towels, swimsuits, meal sets, etc. Note: Because of the seams, it is not completely waterproof. Waterproof fabric zipper pouch, black and white chevron pattern. - Color: Black and White Chevron Pattern - Size (Large): 42.7cm x 33.8cm - Size (Small): 29.2cm x 22.9cm - Material: Water-resistant Fabric - Closure Type: Zipper Thank you for looking.