ogp5087102 wrote a review of Platypus Big Zip SL Hydration Bladder on December 21, 2011
A MUST!!!! take off the plastic slider and throw it away. It wears the bladder extremely fast and leads to leakage. ( just close the bag by hand and problem solved ) also carefully remove the metal rivet ring. As far as over priced its worth it for being BPA free but if it wasn't for that fact its just a heavy duty zip lock bag.