Yes, get a pelican case for laptops / notebooks
pelican case types are used by military and waterPROOF, not merely water-resistant. Theyre pressure sealed as well.
Extreme climate conditions that call for more than a simple notebook carry bag
For exotic travel, college campuses where distances between buildings in very rainy climates must be made, or in which one may have to travel any distances thru harsh snow, ice, or heavy rains, most all conventional carry bags designed for laptops are very inadequate. Such zippered or snapped bags both do not keep out very high humidity and do not protect much from a deep soaking in what is most often a cloth notebook bag.
Skyward facing zippers on most notebook bags are poor protection from water. Consider one of several options, that being a waterproof hard-plastic case designed for notebooks, or a waterproof rugged bag or case specifically designed to keep out harsh humidity and water. In the case of very thin watertight weather bags, these can often be used inside your existing notebook carry bag.
Watertight pouches, sealing weather bags, and plastic hard-cases to keep out extreme elements, rain, and humidity from reaching your notebook

themachead
OP is asking about a carry case, not a USE case.