Upper limit of one box = 11.25 \\text{ cm}. For 5 boxes: 5 \\times 11.25 = 56.25 \\text{ cm}, which is less than 60 \\text{ cm}, but this assumes maximum height. The measured height is 11 \\text{ cm}, so the stack could be up to 5 \\times 11.25 = 56.25 \\text{ cm} or as low as 5 \\times 10.75 = 53.75 \\text{ cm}. Since 56.25 \\text{ cm} is close to 60 \\text{ cm}, and the actual height could be slightly higher due to measurement error, it’s not guaranteed to fit.