title_body: How much pressure can a flip top take?
upvoted_answer: The short answer is - "It depends, probably not".
  
  Bottles are usually rated for Volumes of CO2.
  
  Champagne bottles are typically rated for 7 volumes.
  Wheat beer bottles should take around 5 volumes.
  Ales/Lager beers are normally carbonated at 2-3 volumes.
  
  However, flip-top bottles (I assume you mean the ones with the rubber seal) are produced in both CO2-rated and cheap un-rated beverage bottles - found in supermarkets.
  
  As you say 1.044 is quite high - plenty of beers start around that point.  This could generate a lot of CO2 (> 15 volumes) if it fermented out.
  
  The actual CO2 volume calculations are discussed in another answer.
  
  It might be better to transfer the mead to PET(plastic) bottles, and store them in a safe location.