I got this bag with a bike. The owner keep it garaged and after just 9000 miles (mostly road trips), the black nylon had turned brown. I had a similar experience with a Joe Rocket jacket.
Otherwise the bag functions well. The magnets are plenty strong enough. The bag is big enough for a set of winter gloves (not gauntlets), sunscreen a wallet and not much else. The compartment on top appears to be designed for older styled phones and iPods. It's a narrow oblong shape with a small window. Overall it's a good bag if you don't need a lot of room and you don't mind it changing colors from the sun.