A booster seat may be conveniently carried over one's shoulder using a shoulder strap or worn as a backpack using a pair of parallel straps. The shoulder strap is convertible from a shoulder strap into a leash with a handle. A foam core and padded backpack-style shoulder straps, making it comfortable to carry and use. A three-point seatbelt includes a lap belt and pelvic strap, making it extremely safe to use. The seatbelt prevents a child from slipping off the booster seat. The booster seat also includes non-slip pads which prevent the booster seat from sliding off a chair, bench or booth. In an embodiment with thick non-slip pads, the pads maintain a space between the back panel and a backpack wearer's back, increasing breathability and comfort.