I bought a skybag 2 years ago during the rainy season. It is strong and has extra rain protection. I frequently carry my laptop and important documents in it but it has never been damaged. The parachute like cover which covers the whole bag is strategically placed at the bottom of the bag. It is very easy to use and prevents your belongings from getting drenched in Mumbai rains if you travel by bike a lot. The bag also has a laptop place holder in it which makes sure that the laptop remains shock proof.
I do not feel the need to buy a new one my skybag is going on strong!