On sale for $15, cheaper than a handheld bottle + free shipping
1.5 Liter bladder and the smallest amount of storage - fits some gels, bars, gloves & a light hat.
I've only run with it twice, both times as 8 mile test runs.
It carries water and a few little things, but won't fit a jacket (maybe a vest)
The chest strap is vertically adjustable to dial in the fit.
I have nothing bad to say about it, does what it says on the tin.