Price: $169Where to buy: Amazon, InCaseDimensions: 12.25 x 19.5 x 6 inchesWeight: 3 poundsConstruction: PolyesterClaimed capacity: 26 litersTuckable pack sleeves: YesExternal bottle sleeve: NoShoulder carry: YesWaist strap: NoEyeglass sleeve: YesExtras: Keychain loop

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Here’s My ReviewThe Incase EO is just slightly less comfortable for long slogs than the Patagonia, but the soft-touch fabric and elegant design of the EO make it a great choice for business travelers in need of a more polished look. The bulk of the bags I evaluated are designed with a big, main compartment sandwiched by a laptop sleeve on the side that fits against your back and an organizer area for smaller items on the outside. This Incase bag takes a four-layer-cake approach, instead. Its laptop sleeve is large enough for a tablet, magazine, MacBook, and my paperback; the central cavity is ideal for clothing, etc., and then there’s another layer that would be perfect for a sport coat or jacket. (Mesh dividers let you see what you’ve stuffed, so you’re not guessing where you put what.)

Blazed gratingefficiency

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• Amazon Basics Carry-On Travel Backpack• Away the Backpack• eBags Pro Slim• Pacsafe Vibe 28L Anti-Theft Backpack• Patagonia Black Hole Mini MLC Travel Backpack• Thule Crossover Backpack 32L• Topo Designs Global Briefcase• Tumi Essential Backpack Alpha Bravo• Yeti Crossroads 27L

Knowledge Center/ Technical Frequently Asked Questions/ Optics Frequently Asked Questions/ Diffraction Gratings/ What is the blaze angle and blaze wavelength of a grating and how are they related?

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Bonus! Side compression straps and an expansion zipper let you crank down the Incase to fit into the stingy storage area under the seat in front of you, and then let the bag exhale to fit souvenirs from your adventures.

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Blazed gratingmeaning

The sawtooth shaped groove profile of a ruled grating (the longer face) forms a specific angle relative to the surface of the flat substrate. This angle is known as the blaze angle. The wavelength of light that yields the greatest absolute efficiency of the ruled diffraction grating is called the blaze wavelength. Light equal to the blaze wavelength will have a diffraction angle equal to the blaze angle when the incident angle of the light is also equal to the blaze angle.

Is it perfect? Not quite. There’s no waist strap option, but broad shoulder straps and very thick back padding do help keep the ride stable. It would be kinder on my body not to have all that weight on my shoulders, but it’s manageable and was pretty comfy for e-biking, grocery-store strolling, and walking up and down hills in my town.

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The Incase EO Travel Backpack is one of 10 travel backpacks I evaluated for qualities including organization, comfort, and sturdiness as part of CR’s Outside the Labs reviews program.

Comfort, organization, and thoughtful construction married to an elegant design makes this pack best for business travel

The fourth, or outermost, layer has lots of nooks for snacks, notebook, cell charger, cable organizer, pens, and so on. This pocket is thicker than those of most other brands, so there’s also enough room to cram in last-minute items like the magazine you grabbed pre-flight. The organization of this bag shows that someone at this company travels A LOT.