I feel kinda stupid asking this, but right now I am just too tired to figure this out:
x*y*z -> max ???
"When adding length, width and depth the total may not exceed 160 cm"
How much is this maximal in volume, liters or cubic inches? What would be the ideal size for a bag if you wanted to carry as much as possible? 50 cm x 50 cm x 60 cm = 150 liters?