ROCK BROS navy bike frame bag with waterproof function. - Brand: ROCK BROS - Color: Navy - Size: Approximately 8.5cm x 20cm x 5.5cm, Size S - Waterproof: Yes Please check Amazon for more details. Purchased on July 9, 2025, and used about 3 times on a road bike. I bought the S size to avoid hitting my knees as much as possible, but it sometimes touched during my pedaling, so I stopped using it and am now selling it. The design was not bad though... Since it is a used item, please understand that there may be some scratches and dirt.