I want to add that in many places in the US it is not just the distance, but the danger and outright discouragement of walking somewhere. For example, I contemplated using a train to get to Lego Land in California from Oceanside, California. After getting off of the train I would have to walk 1.3 miles, which is only a minor inconvenience. However, after reviewing the walking route google has this qualifier: “Use caution - may involve errors or sections not suited for walking”. This prompted me to review the walk using street view and I came to the conclusion that there was not a safe route.
This is just one example of something that I think should specifically be available. There are many places where walking is encouraged and convenient, but it is by no means universal.
ESR. They have cases as low as $13 with strong magnets and a premium feel.