Meet the pack that'll carry them from first to last bell and beyond. The adjustable chest strap takes pressure off their shoulders, leading to better posture and better days. The reinforced grab handle, durable zippers and sturdy mesh water bottle pockets mean complete convenience. The tremendously tough fabric keeps their new best bud around for the long haul. And finally, fun personalization options make it as unique as the child who carries it.SIZING:SMALL:16"H x 11.5"W x 6"D;Sized for shorter tikes or little ones just starting school, it's best for kids 3'6" - 4'MEDIUM:17”H x 12”W x 7”D; Sized for younger elementary school kids, it's best for kids 4' and overLARGE:18”H x 12.5”W x 9”D; Sized for taller/older elementary school kids, it's best for kids 4'3” and overEXTRA-LARGE:19"H x 12.5"W x 10"D;Sized for middle schoolers and older, it's best for kids 4'6" and over All dimensions are approximate; Small: 16"H x 11.5"W x 6"D; Sized for shorter tikes or little ones just starting school, it's best for kids 3'6" - 4' Medium:;17”H x 12”W x 7”D; Sized for younger elementary school kids, it’s best for kids 4’ and over Large:;18”H x 12.5”W x 9”D; Sized for taller/older elementary school kids, it’s best for kids 4’3” and over XL:;19"H x 12.5"W x 10"D; Sized for middle schoolers and older, it's best for kids 4'6" and over