I just ran my first race today, and yesterday I decided I needed a small pack to carry some essentials like my keys, phone, and a credit card and ID. I ended up going with the Amphipod AirFlow Microstretch Waistpack for $20 from REI (http://www.rei.com/product/798346/amphipod-airflow-microstretch-waistpack).
This pack is TINY when empty, and weighs practically nothing. When you put your items in it, the mesh expands and is able to easily accommodate even the largest smartphone. The pack is constructed of a stretchy fine mesh zipper pouch, attached to an elastic belt with a nylon quick-release buckle. I wore the pack so my phone was just below the small of my back and it worked out great. I was able to snug it down enough so it didn't bounce at all, in fact, after the first few miles I completely forgot it was there.
Now I couldn't see adding hydration to this pack, so I might not recommend it for longer runs, but if you are doing a 10K with hydration available on the course, it works perfectly, and you can't beat the price.
This pack is TINY when empty, and weighs practically nothing. When you put your items in it, the mesh expands and is able to easily accommodate even the largest smartphone. The pack is constructed of a stretchy fine mesh zipper pouch, attached to an elastic belt with a nylon quick-release buckle. I wore the pack so my phone was just below the small of my back and it worked out great. I was able to snug it down enough so it didn't bounce at all, in fact, after the first few miles I completely forgot it was there.
Now I couldn't see adding hydration to this pack, so I might not recommend it for longer runs, but if you are doing a 10K with hydration available on the course, it works perfectly, and you can't beat the price.