I recently got my hands on the Aginkgo Bicycle Seat Bag, and after a few weeks of use, I have some thoughts to share. First off, the durability is impressive. The polyester fabric holds up well against scratches and minor impacts, which is great for someone like me who occasionally takes spills on mountain trails.

The reflective design is a standout feature. Riding home at dusk, the silver tape and optional taillight strip make me feel much safer. Cars actually seem to notice me better, which is a huge plus for urban cycling.

Storage-wise, it's decent but not perfect. While the main compartment fits my multitool and spare tube nicely, I was disappointed by the lack of an additional mesh pouch mentioned in some reviews. The built-in key holder works fine, but it's just a simple elastic loop - nothing fancy.

Installation was a breeze. The adjustable straps secured tightly under my saddle without any wobbling, and crucially, the bag doesn't interfere with my pedaling motion. The aerodynamic shape does seem to make a difference when I'm pushing hard on straightaways.

At $15, it's functional but feels slightly overpriced for what you get. If they added that extra mesh pocket as advertised, it would be worth every penny. As it stands, it's good - just not great.