Heading West

I'm headed to South Dakota and Wyoming tomorrow for backpacking and camping. I hope to avoid grizzlies (as well as black bears) and rattlesnakes. We plan to hike the Badlands National Park and The Wind River Mountains. I learned from last year's trip to Isle Royale National Park to pack LIGHT! I was reading Rod and Sharon Johnson's "Comfortable Ultralight Backpacking." Rod claims that we overpack due to fear. We're afraid of cold, hunger, getting lost, bugs, etc. so we gear up to protect ourselves; makes sense to me! Unlike Rod, I will be bringing toilet paper along-not sure what fear prompts this...