Originally posted by VenusdeVelo
Don't get this one. The mechanism for filling is very annoying, you have to almost lay it flat and they have a huge mouth on the opening so it leaks out when you close it after filling. HIGHLY NOT RECOMMENDED

I will end up going back to my old Camelback which is about 5-6 years old but it's better than the new designs that are supposedly supposed to be for road bikers!
I just bought a Siren, and LOVE IT! The resevoir is rather small (1.5L) but it's great for short day rides! You just have to grab the black handle, fill it and keep holding the handle as you close it up. I have had NO PROBLEM with mine!

Give it a try if you haven't already!

Jessica