I gave up on the idea of keeping coins in a wallet and instead switched to a folding money clip (this one, but many similar are available: http://www.amazon.co.uk/GOLUNSKI-Leather-Branded-Paper-Walle...). They are thinner than regular wallets which I like, and when I start accumulating coins I'll stop in a shop with self-checkout lanes - these usually have a coin tray you can dump them all in. Works for me.