Let's say water-resistant. I wouldn't go swimming in it. But if you walk in moderate rain, the insides stay dry.

Fits exactly Space for the power supply unit is sufficient, but already tight for the mouse

Hey Kayser I can't tell you exactly, but since this is for the ThinkPads, here are the dimensions of one model. Height 2.43 cm Length 23.50 cm Width 33.90 cm If your laptop has similar dimensions, it should fit. LG Florian ^^