The Juice Pack Air is a two-part case that separates near the top as seen above. The phone then slides into the case and the top portion is reconnected to the main base. You can get a pretty good idea from these photos of just how much extra girth the Juice Pack Air will add to your iPhone. The case weighs 2.66 ounces on top of the iPhone 3GS's weight of 4.8 ounces. It doesn't sound like much but you can certainly feel the difference.
Here we have the finished product. The phone was easy to slide into the case and secure but is a little more difficult to remove as there isn't much to grab on to when trying to separate the Mophie case. The case itself matches the iPhone well and maintains the sleek curves of the phone. There are also dips for the speaker and microphone near the bottom so lack of sound isn't an issue.
Move ahead as we check out the internal battery and general usage.