If you have a lot of devices, you need a variety of USB cables with you at all times. DIY enthusiast Chris Robinson solves this problem by stuffing four different USB cables into a credit card sized case.
Included in this little case are a USB micro, mini, micro SD adaptor and an adaptor. Essentially, he just strips the unnecessary stuff off each plug so they're as thin as possible, then solders everything back together. The cables are inside a case that includes handy magnet that keeps it from flipping open. If you're always carrying around USB cables, this is an easy way to do it without taking up much space. Head over to Node for the full guide.