This is my hilly waist pouch. As you can see it’s been used until it’s falling apart.

It’s been with me for the full 4 years of running because it’s just the right size for a mobile phone, car keys, gel and lose change. Plus the belt is elasticated instead of a hard non forgiving belt around the waist. 
I’ve not found another running waist pouch that offers such simplicity and usefulness in one go.