I am considering this based on 40L as I returned 25L as too small for my needs. In this case, my needs increased on the back seat of the motorcycle. 40L is the best size for my BMW R1200GS. I have traveled several thousand miles with this bag and am quite abusive towards it. He is strong as a rock without even thinking about getting worse. As far as I can tell the build quality is excellent and there are plenty of strap alternatives. In my case, I simply throw a belt side to side across the back of the bike. He doesn't move at all.
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