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Any kind of metal storage box that has an overlapped top will work as a faraday cage. Padded envelopes work because the most probable impact point is the edges and they are thick enough to absorb what the glass can't handle. Being in a Corrugated box inside a padded bag is better still
A decent directional antenna pointed at the nearest tower works wonders, mizilplix on diyelectric cars got 2 miles off free wifi @starbucks using a cantenna with a homemade yagi
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