Yes, it’s BYO chalk bag, and good ones have wide mouths so you can get your hand in and out with ease. We like this bag from new upstart Sublime ($27, sublimeclimbing.com). For the perfect grip, go with high-performance chalk from Friction Labs (from $10, frictionlabs.com), which comes in various forms from superfine to extra chunky. “I like my chalk like my peanut butter—a little chunky,” Stewart says, laughing.
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