Platypus Big Zip EVO Reservoirs

That is actually removable, and easy to clean. I got one, and am very pleased with it. No bad taste as I've had with other popular brands I have used. I couldn't help but notice that at the beginning of the season REI had a big stock of these and of the Osprey. Last time I was there, all the Big Evo's were gone, and the Osprey's hadn't moved. I think people are finding out these are superior, and word is traveling. Just my speculation, and YMMV, but I am very happy. If I hadn't gotten in on this deal, knowing what I know now after using one of them for some months, I would happily pay full price at a retailer to replace older, lesser bladders.

Just bought one of these via Amazon ($28.95 and received a day later). Upon inspection it seems like well made and should work well as my primary water bladder. Haven’t yet gotten to use it in the wild.