Reserve room for the complete computer kit
Large laptops may be accompanied by substantial chargers and accessories. Include those objects in the fit check instead of treating the device as the whole work load. Inspect how the computer area opens and whether you can access it without pulling clothing out of the travel compartment first.
Compare capacity with carrying burden
Try a realistic packed load before deciding that the larger variant is preferable. The additional space may help with bulky clothing, but a liter figure says nothing about your comfortable carrying weight. Check the conversion details and current airline dimensions as separate questions, especially if you intend to use it as your only luggage.
Compare it with your actual load
Put this model beside another backpack in the comparison tool. Missing figures stay marked as unknown, so you can see which measurements need checking before you buy.
Open model comparison ↗

