Hydration pack.  No bladder.  Not sure what size fits but looks like a one liter bladder would fit fine.  Good condition.  Slight overstretched spot on bungie in one spot- see pictures for details.  Clean and in good condition.  Zippers work.  Adjustable straps.  Most likely a small or medium, but can’t say for sure.    

Please look at the pictures closely as they are part of the description. 

Only sell/ship within USA.  No exceptions.  No returns, since item is resale.