A tough standard: Otterbox Defender Case Otterbox has made a name for itself as the go-to for heavy-duty phone cases, and the Defender series is one of it's toughest yet. Not only is it durable, but the case incorporates an antimicrobial additive that inhibits bacterial growth. It's also made of 50% recycled materials, so you can feel a little better about the relative environmental impact of your purchase.$52 at Amazon Low cost, high protection: Spigen Rugged Armor Case Most of Spigen's excellent and affordable phone cases are slim, lightweight, and low profile, so it may surprise you that they are also pretty darn tough too. The Rugged Armor has a flexible TPU shell with Spigen's Air Cushion technology to provide maximum protection. The buttons are clicky, and the back has a really nice, subtle texture that looks and feels great and makes it more difficult to drop.$14 at Amazon