Booster seats are meant to prop up kids, so that safety belts hit their bodies in all the right places. Generally speaking, kids use boosters from the time that they’re 35-inches to 4-feet 9-inches tall and are 4 to at least 8 years old.
If you’re traveling and renting a booster seat from your car rental company, it can be costly at about $15 per booster, per day. It also may not be that clean! Instead consider packing your own compact booster seat. Our KidTripster parent-writers put two portable booster seats to the test: BubbleBum and mifold (pronounced MY-fold).