I have used this bag for a couple of years and it works well and is still in very good condition.  I am selling it because I got a new bag at Christmas.  Below is the info from Kuryakyn. 

The Kuryakyn Ultra Tour Bag's large center compartment and two large end compartments per side allow tons of storage space for even the longest trips. Expand each end compartment 2” for that extra room. With its semi-rigid construction, this bag holds its shape no matter what you pack. When mounted to your passenger seat, it also makes for a great rider back support. The weather is nothing to fear, with Kuryakyn's weather resistant construction and self-sealing zippers. This bag provides ample protection for your items. Use the handy shoulder strap for carrying the bag after a long day of riding.

Features:

• Fully zipped end doors and large hatch allows ample access to main compartment from most sides
• Expandable side compartments provide extra room when you need it
• Waterproof zippers with large, glove-friendly pulls
• 1200 Denier construction for durability
• Wide hook-&-loop belt securely attaches bag to any backrest
• Included Items: Bag, Shoulder Strap, Adjustable Universal Straps, & Rain Cover
• Cubic Inches: 3,960 Collapsed and 5,280 Expanded (86L)

Dimensions: 16 1/2" High x 16" Wide x 15" Deep (Expands to 20" Wide)