Very small zipper case with shoulder strap - Perfect for GoPro or other small devices.
I found this case as very handy protection and storage for our GoPro camera and accessories, waterproof. But of course, you can put other stuff like wallet, tissue, keys etc etc...
small - 9cm x 10cm x 3cm
storage for GoPro camera, spare bateries (at least 2 or 3) and spare memory card
a pocket is located in front of the case for storage as well
it should be easily clipped for example on backpack or waist bag
easy to carry - carry over the shoulder - an adjustable shoulder strap is provided - handy when going for a walk in the city
Safer option – pulling the belt through the strap loop at the back - allow to attach the bag to the belt.  Safer (due to potential falling off or theft) is to pull the belt directly through the loop of the case strap