SanDisk iXpand Flash Drive 256GB.
Some highlights from the product page:
- The flash drive for your iPhone and iPad
- Quickly free up space on your iPhone
- Automatically back up photos and videos when connected
- Watch popular-format videos directly from the drive (.WMV, .AVI, .MKV, .MP4, .MOV)
- Designed with a flexible connector to fit through most iPhone cases