Joined Mar 2013
3K Posts | 161+
Naples, IT
I've been in the worst storms Florida has to offer and have never had standing water in the bag. The inner felt will dampen and it will drip from zipper seam.
Could be that you were just drenching the bags instead of simulating a bike at speed with laminar flow helping shield the bags some.
I'm thinking the only way to truly waterproof them is a full cover that draws tight around the mounting arms. Mostly found model specific covers like this: Arkel Pannier Cover
There was a member that coated his bags with a waterproofing spray that you can buy at hardware stores. They looked like ass.
Could be that you were just drenching the bags instead of simulating a bike at speed with laminar flow helping shield the bags some.
I'm thinking the only way to truly waterproof them is a full cover that draws tight around the mounting arms. Mostly found model specific covers like this: Arkel Pannier Cover
There was a member that coated his bags with a waterproofing spray that you can buy at hardware stores. They looked like ass.