Kathmandu has $20 plastic covers for backpacks that make them waterproof.
"People are stupid ... almost anyone will believe almost anything. Because people are stupid, they will believe a lie because they want to believe it's true, or because they are afraid it might be true. People's heads are full of knowledge, facts, and beliefs, and most of it is false, yet they think it all true ... they can only rarely tell the difference between a lie and the truth, and yet they are confident they can, and so all are easier to fool." -- Wizard's First Rule
Bookmarks