Source - Widepac Ultimate 3 - Hydration system tested

I bought this expecting magnet and filter adapter to be included, but they weren't, i only got bladder and the hose, but since there were no leaks first time i used it, i decided not to send it back as shipping cost is close to 10€.
I wanted to use it for the second time last weekend, filled it up with water and luckily i noticed the leak by the time i ended up packing. My backpack was soaked. It's leaking from under the cap. I made sure its shut properly, but no matter what i do, it keeps leaking.

I'm happy with regular widepack and would buy it again, but i'm skipping versions with cap from now on.