Next, there is the GranTour Bag (MSRP: $169.99), which also has multiple mounting options. It measures 18 inches tall, 14 inches deep, and 20 inches wide. This bag will sit on the sissy bar or luggage rack (the passenger seat will also work in a pinch). This bag is great for an overnighter but also big enough for a short trip. It has a large center pocket along with smaller side pockets for quick access to things such as cameras and so on.
If you need major storage, then the Ultra Tour Bag (MSRP: $129.99) is what you're looking for. Measuring 17 inches tall, 16 inches wide, and 15 inches deep, the bag can expand up to 20 inches wide. As with all the other bags, the Ultra features sealed zippered ends, 1,200-denier construction, and a wide hook-and-loop belt to securely attach the bag to any backrest.
The Ultra bag has a large main hatch to allow access to the entire bag. The bag comes with a shoulder strap and two other adjustable universal straps that can be used to convert it to a backpack when it's off the bike. The Ultra is ideal for long trips, or for two people on a short trip.