This model: https://www.amazon.com/gp/product/B00VUZNG9Q/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Thought I'd save a few bucks over a Source bladder. It made it through all my training without mishaps (although I did crack the hanging loop, which I replaced with some line and shrink wrap).

When I did my GRT in September, the sealing clip pulled off before I even made it to the inspection phase of the Welcome Party. "Fine", I thought, "I guess I must have rolled on it or something". But I ended up doing the first 5 hours of the event with no water...

It failed again this week, one set into a rucking session, and I ended up with three liters of water pouring down my neck the first time I dropped into a pushup position.

So done with this bladder. Source bladder is on order now.