A cigarette case I designed for my mother in law

I'm an enabler. Holds 20 cigarettes smaller than 8.5mm in diameter the walls, lid and bottom are 2mm thick the internal height of the box is 100mm, 98mm to make sure the latch has room to slide freely, so a bit packing is necessary before putting store bought 100s in. this isn't a problem for us since we pack our own and it results in the cig being about ~2mm shorter than a proper 100.