A dry bag will save the day! When nasty weather is upon you, but you have craftily packed your belongings in a waterproof bag – and THEN put them in your backpack – no worries. A pack sack is what you use to keep your stuff in order inside that dry bag. How about crossing some watery obstacle? Put your shoes, backpack, and clothes in a big dry bag, and swim to the other side. The best dry bag can also be used as a flotation device! After the swim, put your clothes and stuff back on, and off you go on your adventures.