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The 21L GR1® is 18" tall and the 26L GR1® is 20" tall. The Classic 21L GR1® fits all shapes and sizes. If you’re ~6’+ and/or want 5 additional liters and 2” of additional height, go with the Larger 26L. When moving through airports, commuting, or rucking, the goal is for your ruck to be high on your back. No matter how tall you are, the 21L will rest 2” higher than the 26L. When in doubt, go with the 21L