if you're planning to take your GPS logger on the road, you'll want to protect it. Thats especially true if you're planning on a hike or sailing trip.
An easy source of nice cases for your portable project is digital camera cases. You can get them at your local camera/electronics shop or online. Look for ones that measure about 4" x 3" by 1"
If you use a smaller battery holder and skip the USB connector part of a mintyboost, you can stuff all of that in a series 1000 case as well
The 2000 series is a little larger and can hold an Arduino, GPS logging shield & Mintyboost as well as your toothbrush and some trail mix.
The cases come in clear so you can easily see blinking LEDs.