Is there a special bag for the radians and travel? We have 2 but haven't traveled with them due to weight and heft. Our last flight, we were able to fit our Graco snuggled inside the Scenera in a car seat backpack, but now that both kiddos are in convertibles I'm more nervous about the airport hauling and looking for a plan

. I'm thinking we'll have at least one 2-convertible-car seat flight before ODD can graduate to a booster.
That said, we've been very happy traveling with the Scenera (it's also our second car car seat foR ODD). It's lightweight, a quick install and pretty inexpensive (I think it was around $40). It also had pretty good reviews, so if your looking for a back-up/second car/travel seat this might be a good option (certainly doesn't have all the bells and whistles of the Diono, but gets the job done!)
ETA: if you need a narrow car seat the diono Radian is amazing. After much research I got two and they are next to each other in my civic - with enough space to actually have a passenger in the remaining seat. For smaller cars they are perfect!