Box.com is offering free accounts with 50GB of of cloud storage for iPad & iPhone's. You'll need to download the Box app in iTunes and set it up to activate it. The offer is available from January 15, 2014 to February 15, 2014.
I know previously when they offered this you were limited to a max file size of 100MB. Still not bad, and it's easy to work around if you have to store a large file.