Hi,

I have a 5 and a half y.o. and 4 y.o. that are both in combination seats (Graco or Century-ish) because they are less than 40 lbs. and are both in a 5-point harness. I also have a 22 month old in a Britax Roundabout. We are flying soon and tired of packing three full car seats.

What do you think of those boosters that are just a seat (with no back or sides)? Are they unsafe? My 5 and a half y.o. is probably close to 40 lbs.

Thanks.