I've had a Trax top case for 4 years. Be wary that the aluminium mounting system wears out quickly; the plates and pegs rub and get sloppy. Mine started rattling after a year and then started detaching itself on a regular basis. I've now done away with the crappy catch and bottom plate and have bolted it straight to the rack.

It also leaked until I sorted it with frame sealant. However, I believe the latest EVO versions have cured this. The mounting system has not been updated though.

Can't comment on the side cases - they may be better?

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