Bags perfect for you
Will the Diono Rainier car seat fit in this bag?
Yes, it is very roomy for most car seats .
Is this compatible with any of the Peg Perego car seats?
It's a large bag, I have a recaro pro sport, I believe that's as big or bigger than the peg. It fit just fine.
The Product dimensions 27.5 x 25.5 x 20 inches
Here are the bag DIMENSIONS: 34in. X 18in. X 18in. (86.4cm x 45.7cm x 45.7cm).
Will this fit the britax roundabout?
Yes. I have both a Britax Marathon and Roundabout and they both fit.