The water repellent Expedition Deluxe is great for commuting, touring or any activity where you need to carry more than you can fit in a backpack or courier bag.
Need a quality rear rack that you can depend on? The Delta MegaRack Ultra Rear Bicycle Rack is the answer.
This is a good bag fits my rack nice and tight doesn't shake when I ride. It is adjustable so I was able to move it back so it doesn't conflict with my riding at all. Very impressed with it.
I purchased two on sale for my commuter bike. I've been riding with them for the past two weeks and they have performed great, exceeding what I expected for the price. They are secure, functional, roomy and unassuming so I don't have to worry about them as much.