I've used two of these bags for about a year now. I commute to work (10 miles, round trip) carrying BIG loads every day: old, *heavy* 17" laptop, lunch, papers, rain gear, clothing, tools, and lots of random items. The bags handle oversize loads well and show no wear. The waterproofing works great. The quick latches hold well and make it easy to lift the bags off my rear rack. I have used one, occasionally, as a shoulder bag. The strap is adequate for short walks. I've used many panniers and packs over my commuting career (20+ years) and these are my favorite, by far.