This is a good waist wallet/pouch. It is made from very thin polyester material, but it is sewn well and it is durable.
It is thin enough to fit under clothes without much bulk, but it is also large enough to fit a cell phone, passport, money, etc.
The waist band is soft, elastic and has a nice strong clasp.
I wasn't particularly fond of fanny packs before I met this one. Never knew how useful they could be.