We have gotten some really good rains in May, and hope to see some more upcoming. An essential item this time of year are Ziploc Bags. They make all ranges these days, and are seemingly available everywhere. They are great if you are traveling and find yourself without all the dry bag gear and high tech equipment meant for this type of thing.
If you think of it before you travel, look around and find some of the larger bags. The two and three gallon bags are perfect for laptops or cable groupings, even serve as pretty good packing cubes.