I ordered a CNOC 2ltr bladder for an upcoming 30 day hike in the Pyrenees on 19th June I needed this one especially to match the thread off the Mini Sawyer water filter. I didnt even try the filter... I filled the CNOC the night before I had a race on friday and put it in the fridge, the next day water everywhere- brand new product... I dont have the time to return it and receive a new product- complete waste of time. No matter how you try to close it will let water out.