Most tech backpacks indicate the maximum laptop size they can accommodate, usually in inches (13", 15", 17", etc.). Measure the diagonal length of your laptop screen (not including the frame) to match it with the backpack’s capacity. If you have a bulky case on your laptop, check for extra space in the laptop compartment. Choose a backpack with a slightly larger compartment if you use additional padding or cases for your laptop to avoid a tight fit that can damage your device over time.