better known as the "Astral Buoyancy Full Bladder – 1.8L", it is essentially a 1.8L Platypus Hoser with a strap. The 1L and 2L from REI are both $22.95, so at $13.99 this is a steal, you just have to figure out what to do with the strap.
they have 86 this round, and I'll guess they will have it up again, previous rounds it's been $15.99 and $17.99, so they may be running out.
