Sports watertight phone box
thingiverse
Box designed for a sportive activity which protects your phone from water. Mount 2 greased silicon o-rings in the grooves with dimensions: ID 81 x 2mm Close the box with an o-ring ID 115 x 2.5mm Put a nylon cord thru the holes on the side and make a firm knot long enough that you can carry the box. The inside dimensions are 105 x 22.5 x 172 mm, large enough for a phone and some keys and money.
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