You may have read about the “Cabin OK” initiative launched by the IATA — and the confusion surrounding it. Note this clarification excerpted from a recent New York Times article about the campaign:
“The new proposed guideline is not a maximum but an “optimum.” Airlines are still free to set their own, higher limits. You do not need to replace your bag. The association’s idea is simply that smaller bags, approved through an I.A.T.A. program and bearing a “Cabin OK” logo, should get priority to stay on board on those full flights where some bags must be gate-checked.”

Even though the campaign has been put on hold, we’re guessing you might be wondering if your Aeronaut 45/Aeronaut 30/Tri-Star/Western Flyer will fit the originally proposed (as of 06/11/2015) IATA “Cabin OK” sizer dimensions of 55 x 35 x 20 cm / 21.5 x 13.5 x 7.5 inches.

The short answer: Yes. If you have one of our bags, you’ve chosen soft-sided luggage and all of its advantages. Because bags like the Aeronaut 30, Tri-Star, Western Flyer and even the Aeronaut 45, are soft, you can often squeeze them into sizers they technically shouldn’t fit in based on their exterior dimensions (as long as you don’t overpack.)

But you know us: we like to really test things. Ben (our Materials and Facilities Manager; you know him from our Cord Zipper Pull How-To video) made a mock-up “Cabin OK” sizer:

TOM BIHN Aeronaut 30 Travel Bag "Cabin OK" IATA

Results below. For continuing coverage on this topic, follow One Bag, One World.

Aeronaut 30 Fits easily in the sizer, even fully packed.

Aeronaut 45 Fits in the sizer as long as you don’t overpack it (it shouldn’t bulge at all). For an easier fit: stow away the backpack straps and underpack it a bit.

Western Flyer Fits easily in the sizer, even fully packed.

Tri-Star Fits easily in the sizer; just be mindful to not overpack it.