I have my 8 oz SS hip flask cut off at the top rim. It serves as a sturdy EDC container, protecting my solar charging powerbank in the front pocket of my sport coat. It can be easily converted into a boiling/cooking cup (by prying out the concave wall to increase the volume and using a wire in predrilled side holes to hang it over the fire). When stuffed (with the powerbank, disposable rain poncho, AC/USB charger, USB cable - it is heavy enough to work as an impact weapon.