#flask  bottle that has a narrow neck
  supertype:  bottle  glass or plastic vessel; cylindrical with a narrow neck; no handle
  subtype:  ampulla  a flask that has two handles; used by Romans for wines or oils
  subtype:  canteen  a flask for carrying water; used by soldiers or travelers
  subtype:  Erlenmeyer_flask  a conical flask with a wide base and narrow neck
  subtype:  hipflask__pocket_flask  a flask that holds spirits
  subtype:  round-bottom_flask  a spherical flask with a narrow neck
  subtype:  vacuum_flask__vacuum_bottle  flask with double walls separated by vacuum; used to maintain substances at high or low temperatures
     subtype:  Dewar_flask__Dewar  vacuum flask that holds liquid air or helium for scientific experiments
     subtype:  thermos_bottle__thermosbottle__thermos__thermos_flask__thermosflask  vacuum flask that preserves temperature of hot or cold drinks

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