I'm looking for a carrier that fits within the specific pet carrier size requirements for Jet Blue (not exceed 17"l x 12.5"w x 8"h), we are going from Austin to Long Beach. The Jet Blue carrier sold on their website is too small for her, my pup is almost 9lbs and needs a bit of room. Does anyone recommend a soft carrier to use that comes close to these requirements? Has anyone had issues with a carrier that was a bit larger than the required amount on a Jet Blue flight??

Any info helps! Thanks!
Meant to add that she will be in the cabin with us.
one last thing.. the Jet Blue carrier is
16 x 10 x 8.5 inches