30L Expandable Tail Bag with Waterproof Cover, Helmet Bag

Good price and quality.

The bag works very well, whether laying flat on the bike or verticle while walking with it. The internal straps keep things secure to a good degree. Mounting was easy enough, I just had to adjust the locations of the straps to make sure they did not dangle too low when I ride without the pack. 2023 Triumph Bonneville T120

Exceeded expectations. I can fit an entire helmet in here with room to spare.