EVA Air adds the dimension regulation for Personal Items ( such as a laptop, a purse or a small backpack etc.) carried onboard the aircraft by passengers

For your comfort and safety, in additional to dimension limitation on hand-carry baggage, effective from JUL 01, 2018, “Personal Items” carried by passengers are also subject to dimension regulation with 40 x 30 x 10 cm /16 x 12 x 4 in or total linear dimensions 80 cm/32 in. 

Please click Carry-on Baggage for more details.