I like to hike in simple T-shirts and running shorts, even in cold weather, so I use a lanyard with an easy-release fitting - to avoid being choked - that holds a whistle, small knife, lighter, and dental pick. I get my lanyards at BizMart or Office Depot for about $2.50.

Other small stuff goes in a ditty bag with a secure closure so it won't come open accidentally. Bright colors and glow-in-the-dark help as well. A little florescent paint goes a long way on small stuff.

Dental pick? Substitutes for floss and is always handy after a snack. OK, That's weird. So what?