This may be niche, but I have used these before on long runs and so I took them with me for a half marathon I just raced, and the chews themselves were fine but the packaging was SO HARD TO OPEN. Usually with other gels/chews you can just bite off the top or rip it easily, but both of the packages of the Bloks I got were near impossible to open while racing. I thought I was crazy for struggling to open them but my friend had the exact same issue too.
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