Soft-sided pet carriers for cabin travel

In-cabin soft-sided carrier SERP is a commercial battlefield: Wirecutter's 8k-word tested roundup (SturdiBag, Petsfit, Sleepypod Air, Tavo, Away, Mr. Peanut's) is the quality ceiling. Thomas Acres published a long eight-carrier comparison with size contradictions and prep. Amazon category pages, Chewy, PetSmart, Walmart, brand sites (Mr. Peanut's, Petmate, Away), and Facebook 'which carrier for airline X' threads fill remaining slots. Affiliate listicles (just4mypet, birdsfanatic, Artemis Paw, Harvard Apparatus Regen) repeat 'best of 2026' with thin or unscrapeable bodies. CN Traveler and Travel + Leisure exist as prestige roundups. Winnable gap is airline-by-airline under-seat measurements, zipper/mesh failure after a year of flying, and escape-at-TSA ops—not another six-pick gallery.