I use Fisher, which has prefilled 40/20 formalin containers (and other
   sizes) individually  wrapped  in groups of 20 (or 25, I can't remember
   now).   This comes in handy for distribution to offices.  I don't have
   any  problem  with leaking lids unless the clients don't screw them on
   tight.  I have never had them leak before sending them out.
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