Aerostich is the only way to go. I tried some of the popular ATV bags on a 10 day trip last summer the zippers failed on day 2. Aerostich high viz bags now, waterproof unbelievable quality and function and the fit my 1k with givi crash bars is perfect. Oh course I took a huge dose of the stitch kool-aid over Christmas with a full suit and the panniers so maybe I am just drunk.
3rd BMW GS Trophy Challenge Qualifier 2012
IBA# 34681 (SS1000)
"luck played a fundamental role" Carlo Boffi