Reddit reviews Liberty Bags Large Drawstring Backpack, One Size, BLACK

I purchased a few of these (not the exact ones) a couple years ago! I made sure to get a bright color that would be unique and easily recognizable when mixed in with a bunch of other runner's bags. They were cheap and I am not worried about losing them. I also make sure to line the inside of the drawstring bags with a plastic grocery bag if the weather is rainy just to make sure my supplies stay dry.

I have one of these folded up in the inside pocket of my jacket for just such an occasion. You guys might want to invest in one!