Used these every time we traveled. 3 available • mifold is the world’s most compact backless booster, the mifold Original booster fits into a child’s backpack, glove box or parent’s handbag, making it perfect for carpooling, as a travel booster, for ride sharing and much more. • mifold Original is designed for children aged 4+, 40lbs and 40-57" tall. mifold ensures optimal seat belt fit by pulling down the adult seat belt to fit the child safely and securely. • Meets or exceeds NHTSA standard FMVSS 213 in the USA and is regulated for use in every state.