In some cups the bottom may detach.
If the bottom of your cup detaches while containing hot liquid, you could be burnt or scalded.
What to do...
Stop using your cup and return it to the place of purchase for a replacement.
Alternatively, you can contact Biopak Pty Ltd for the new cup.
Sold from February 2013 to April 2018
Affected cups contain a small rectangular mark on the inside base of the cup.
Biopak 12oz ByoCup Reusable Coffee Cups
BM-BCR-12-W / BM-BCR-12-G in plain green or white