Your MacBook, especially if it’s an Air, has fairly limited storage. You can do a few things to deal with this, such as be very selective about the things you keep on your hard drive, and deleting old, unused files. But if you’ve done all that and are still running out, you can expand your memory fairly easily with the HyperDrive MacBook Storage Expander. It fits right into your MacBook’s SD card slot, and contains a MicroSD card of any capacity. It accepts any microSD, microSDHC, microSDXC (including 128GB) memory card, and has a brushed Aluminum finish for a perfect, flush appearance. Your MacBook will look stock, but will have up to 128GB of extra storage, just like that. It’s $29, down from $40, and comes with an 8GB card.