I bought this bag for my 2016 Yamaha Bolt. For the most part I have no complaints about it. It's not listed as waterproof and comes with a separate case, but I got out in the rain without a case and it was still dry inside. It has 4 attachment points on the bike. Two clips, just like a regular sports bike bag. The other two are large Velcro straps that run around the back. The only complaint I can make is that these straps are way too long for my bike. My sissy bar has a thinner profile, only about 8 inches wide, so there's a lot of extra straps dangling around it. I overcame this by tying it on the sides as there is a small velcro pocket on each side. The seats are decent, allowing me to carry a spare skull cap, goggles, face mask and gloves with a bit more room. It is also part of a bag set for long trips. The second, large bag is placed underneath and attached to it. Overall the bag is good, the straps are a little long for my bike but it stays attached and works well. In my opinion, the "expandable" bay doesn't really offer that much more space, but I think anything is better than nothing.
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