Wallets are a flat piece of material, often leather or leather-like materials, that is used to hold currency. Wallets often have compartments for paper money, credit cards, identification and coin money.
About Zipper:
A zipper, sometimes called a 'slide fastener' is a device consisting of two toothed tracks or spiral metal or plastic coils, each bordering one of two edges to be joined, and a piece that either interlocks or separates them when pulled.