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American Kargo 3519-0003 White Turbo 1.5 Hydration Pack
The Turbo 1.5.
The slightly smaller frame works well to limit any unnecessary weight.
This is truly the fly-weight version of hydration.
The fittings and adjustments make sure it's in the same place when you get off the bike as when you got on and tightened it down.
Fill it up, put it on, strap it down and take off.