Rating: 5 / 5
I have used an inexpensive bladder from Big5, an expensive bladder from Camelback, and a bladder unit from Source.
The Source it is by far the best that I have used. It is designed and built in Isreal for their military. It has both the flap top like a Platypus and a threaded cap like many others. A really cool feature is the quick release connections. The bite valve is amazing and it also has a dust cover for the bite valve. The hydration tube is also insulated.
I have used it alot and hard, it has never leaked. The mentioned features make it super easy to clean as well.
Price wise it is about the same as the Camelback units, however there is no comparison in quality.
I found the Source products by reading different blogs about hydration bladders.