I've only used CamelBaks, so I can't comment specifically on the MEC product. The only time I've had a leak is when I inadvertantly pressed on the valve when my CamelBak was sitting next to me on the car seat as I was driving to a ride start (as in when I wasn't using it!). But there shouldn't be any leaks regardless of where the hose and mouthpiece lives.
I would recommend changing out the hose/mouthpiece. I know that you can get just these parts for a CamelBak, so I'm assuming the same is true of the MEC product.
--- Denise



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