When you’re not in a prison shower, bar soap is great. It’s manly. It’s rectangular. And since it is soap, it’s never dirty. But, when you finally wear that bar down to just a sliver, things get real dicey. STACK Infinity Bar Soap ($12.56 for a pack of 6) is specifically designed to avoid the pitfalls of tiny, slippery soap by letting you stack your little sliver on top of the next fresh bar. A specially shaped groove and grippy, raised lettering form the perfect soapy union. Coming soon to a jail near you?