Ortlieb, are really great they fit securely on the bike very adjustable, and very waterproof. Why would anybody want to line there panniers with garbage bags when they make waterproof panniers. The rain covers for panniers are fine unless you are in a heavy downpour then the water collects at the bottom and gets your stuff wet. Ortlieb also can convert into a backpack when you want to get off and explore. I think it's forty bucks for that option. Have a good time on your trip