Maybe you don't need quite so much hydration capacity. The small Bottle Pocket is for you, fitting a .5 liter size of either a Nalgene-style bottle, purchased beverage or traditional sport bottle.

Features:
Fully Adjustable Waist/Belt/Shoulder Strap, Fits on Any Belt, Easy Access

Materials/Construction:
1000 Denier Cordura, 3/4 in. Nylon Webbing, Bound Edges