Find the canvas guy the commercial fishermen use. I have my FB Garmin in a Navpod that is covered, for want of a better word, in a Sunbrella drawstring sack. Know you don't want the Navpod, but same idea. The drawstring (same as the drawstring on a hiker's stuff sack) has stayed secure through some serious weather and is easy on, easy off. Lasted 7-8 years and still in good shape. Don't remember exactly cost, but do remember it was pretty cheap - like $40-50.
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