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Race vest with soft flask(s)? But just get the Decathlon backpack with 1l bladder. A new design, better than the last design which I used for a year and got on with but this one is better, smaller bladder with the idea if you want to carry more water there is space for soft flasks on the front.
Edit: Sorry that was a bit blunt. The Decathlon pack is about £25, way cheaper than the competition. Decent quality. Useful if you need to carry a little extra.
What do you guys use to hydrate on longer runs? What’s in between a bottle in the hand and a backpack with bladder? One of those belt things?