These sachets are amazing. The key thing for me is that there’s no stomach issues at all with them. I’ve had stomach discomfort with certain brands of gels before so I won’t use anything else now. Mixed with water & carry the liquid with you. I’m using a hydration belt with 2 x 300ml bottles they will have Tailwind made up in them for the London Marathon this year.I have more energy when using them. Did my 20 mile run at the weekend & could have easily carried on. I’m no athlete!!! Couldn’t recommend this enough!