Hydration Pack for Running - Worth while?

Are hydration packs for running a good idea? I’m stepping up my distances to enter my first half marathon in a few months, and whilst the training is going ok, my mouth feels very dry toward the end of longer runs, and I seem to drink glass after glass of water afterwards. Someone mentioned a hydration pack would... show more Are hydration packs for running a good idea? I’m stepping up my distances to enter my first half marathon in a few months, and whilst the training is going ok, my mouth feels very dry toward the end of longer runs, and I seem to drink glass after glass of water afterwards. Someone mentioned a hydration pack would be a good option, but that sounds a bit bulky for running with isn’t it?
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