Two incremental but important changes—wider seats and redesigned bins—have been announced for Boeing’s new 737 MAX, which will take to the skies in 2017. This isn’t just about passenger comfort, either. The changes are also intended to make flying a lot more affordable.

At the heart of the 737 MAX project is a promise to reduce the cost-per-seat by 8 percent, a savings that Boeing claims will give it the lowest operating costs of any single-aisle airplane. What’s more impressive is that it’s mostly design decisions which are being made with the goal to reduce the airplane’s weight and therefore the amount of fuel it uses—which is where the money is saved but is also good for obvious environmental reasons, too.

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Boeing’s philosophy for the 737 MAX is smart business as well. Spending less on fuel will help carriers pass along savings to passengers, which will in turn bolster the airline industry—meaning everyone will need to buy more planes.

The cost-per-seat method is good math but it also particularly helps one sector of the industry: the low-fare airline market, which the 737 MAX was specifically designed for. At the Aircraft Interiors Expo in Hamburg, Germany this week, Boeing reps discussed two of the biggest changes for Alaska and Southwest, which will actually roll out separately on other versions of the 737 before 2017.

Raising and lowering overhead

Perhaps the biggest news is a new overhead bin design that will hold 50 percent more bags. Yes, 50 percent! A small vertical expansion of the bin now allows bags to be placed on their sides, which means six bags can fit sideways where only four fit flat. According to Wired the new size rebalances the bins which will actually make them easier to swing down. When the bin is open it also sits two inches lower in the cabin, making it easier for everyone to reach.

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Since they’re the same size as existing bins, these newbies can be swapped on planes currently in the air, so Boeing customer Alaska will be putting some of them on their 737 Next-Generation planes by the end of the year. The new bins will then be standard on the MAX in 2017. 50 percent more bags!

Butt wait, there’s more

In a partnership with Southwest (who gets the first batch of 737 MAX planes), seats will be widened to 17.8 inches wide, compared to 17 inches now. According to Bloomberg, the new seats have an adjustable headrest that raises vertically and a storage space on top of the seat back. In addition to giving passengers a little teeny bit more room, the change is estimated to cut 200 pounds from each plane.

These seats can’t fit into existing aircraft, but they will start to show up on Southwest’s new 737-800s next year, and then on all MAX planes in 2017.