i bring my bag with me with both lens but i just leave it in the car. i have never had to change my lenses while riding. as long as u don't chose the worst color for that condition i think i will alright for a couple runs till u get to ur car.
My Volcom jacket has an inner goggle pocket that wraps around your ribs so the lens is protected in there. I'd probably put them in a couple goggle bags. If you break them in there, you probably were headed for broken ribs anyway.
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