I have the tri-bag system and it's great if you are tall like me. The wife and I took a week long ride up the coast with the top of the bag just under my chin the entire trip. The next year I made the same trek but bought a Ventura bike pack system instead.
Once installed, the system mounts on rails and away from the bike's plastics. The wife an I road the entire week with no problems. You won't even know it's back there.
I still use the tri bage system for day-to-day, but on the long trips I'll hook up the Ventura system everytime.
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The grab rail is great when you're traveling and you plan on spending some time riding around without the full pack. This came in handy for the races at Laguna Seca last year as we hit it in the middle of our trip. After checking into the hotel, I removed the big bag and rode around the rest of the weekend, sporting the much smaller grab rail.
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This is a smaller version of the main rack and actually I have yet to use it. I've only been on trips which require the large bag and have yet to utilize the smaller rack.
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Here you can see the main luggage rack with the big tall rail that helps support the bag. The bag slips over the top rail and clips around the bottom rail so it's nice and secure when riding. Easy on, easy off.
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This is how the system looks when configured for two up riding. If you're riding solo, the pack can be swung around and rested on the rear seat. I was a little curious how the bike would perform with the bag hanging out there, but the bike rode perfectly and seemed as though the bag wasn't even there. Sometimes I even forgot it was there and although it's only rated to 70mph, I can attest to speeds much greater than that.