Osprey duro 1.5
Its a real vest, not backpack; super comfy has lots of adjustability so it does not move and chafe.
Lots of storage area for phone, gels, food, etc.
comes with pretty good bladder in the back that has a flat shape so not a lot of sloshing. I mostly use it with two soft 300ml bottles in the front and on really long runs use front bottles and bladder