Used this bag for a 80 mile weekend it rained all day for 2 days straight. No issues with the bag or zippers and most of my stuff stayed pretty dry. I would buy again its a good price and I can easily put some grommets in before the next big trip.
The bags are very solidly built and have heady duty zippers and lots of space. The fabric is waterproof and the two side panniers have metal clips to hang from your rear rack. Everything attaches to one another for a solid fit. Have a 200 mi mountain bike trip combing up with these bags and I have no doubt they will perform as needed.