According to the features it has a hydration sleeve, but according to the pictures I don't see how a hydration bladder could fit in this pack. Where would it go and how many litres reservoir?
STEPHEN A The sleeve is the same pocket that holds the removable closed-cell foam flysheet. There is also a hanging clip that is compatible with most bladders, as well as a port for the hose.
CANDACE Y There's a padded "pocket/sleeve" inside the pack in the back for the hydration bag. It's pretty large. Easily big enough for a 2 liter bladder.
Probably even up to 3 liters would fit.
LUIS R I haven't experimented much with a bladder yet but there is a hook on the inside of the pack where a bladder can be hanged. There's a divider inside that could be used to separate the bladder from anything else that is put in the pack. I'm not to sure as to the actual amount or size that could be used but it looks like a decent amount of space for one.
MAKSYM S Hydration sleeve is where it typically is (right behind your back) but the access to the sleeve is from the inside of the pack - not the most convenient design as you can't refill it without taking the bladder out and can't easily take it out from the full pack. It has a hook to keep the bladder from sliding down further than necessary. The slits for the tube is right behind the hanging loop between the shoulder straps. I've used it with 2-liter bladder from my camelback, you probably will have a hard time fitting bigger bladder. But with these reservations I can wholeheartedly recommend the pack - light, extremely comfortable and adjustable, right volume/configuration for my needs and very reasonable price