Camelbak's ULTRA BELT 500ML is an unobtrusive yet highly functional hydration belt.
Supplied with a foldable 500 ml Quick Stow bottle that adapts to your body shape, this model is made from 3D mesh material that remains lightweight and breathable even on the hottest runs. The advantage of this belt is that its bottle, once empty, folds up for easy storage. This model is also packed with features, including a secure phone pocket, and an additional pocket for gels, keys and maps.
Not forgetting that this belt also has a trekking-ticket holder for more technical descents.
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Size guide (hip circumference):