iPhone Air ケース - ウォレットヘビーデューティーフォンケース - Casebus ヘビーデューティーウォレットフォンケース、クレジットカードホルダー、フリップスロット、二層衝撃防止保護カバー - JESSIE - Casebus

The built-in credit card slot sits flush enough that I can still slide the phone into my back pocket without it catching. Dual layer shell feels solid without adding too much bulk, and the flip slot has saved me from digging through my bag for my transit pass at least a dozen times.

The card holder flap actually snaps shut with a satisfying click, and it holds two cards and a bill without adding much bulk. The dual layer frame feels rock solid in my hand, so I don't worry about drops anymore.

Dropped my phone twice this week on concrete and the dual layer absorbed it like nothing—screen's still flawless. The flip slot is stiff enough that my debit card hasn't slid out once, even in my back pocket.