If I remember right, the sleeve is 25" wide, so yeah it will fit with an inch on each side. Not the end of the world. This is the exact setup I have for my 8-year old daughter who's starting to hike/backpack with me. Roxy Ann 15 and a Klymit Static V that she loves. I'll get her a different pad for colder weather trips.
@Warren, thank you for reaching out!
While it's an option, a 23-inch wide sleeping pad in the Roxy Ann 15 doesn't quite fit together.
I can suggest using 20 x 66 inch sleeping pad with the petite bag or a 20 x 72 inch sleeping pad with the regular bag because those options are compatible with one another.
Hi @Warren, thank you for your question!
Even though you posted this question on the "Ask an REI Employee" board, you may also get suggestions from other members of the community. We wanted to provide a friendly reminder (from our User Guidelines) that "only posts from a user with the “REI Employee” rank should be regarded as employee-generated content."