Saved films take up the most space, and 25MB should be enough to hold several longish 16-player games. We don't think the average user will be hurting for space.
"But wait!" you exclaim, "I'm not a merely *average* user! I plan to win every motion picture award there is with my exquisitely choreographed, epic-length saved films!" And *that* is where Bungie Pro comes in. "Bungie Pro?" you ask, an eyebrow raised. "I'm listening." While we can't give huge amounts of free storage to every one of our users, (note that unlike webmail sites, Bungie.net remains ad-free,) we're happy to accommodate power users with a premium storage option that we've dubbed Bungie Pro. Inside your file share, you'll find a button that will lead to an Xbox Live Marketplace panel, offering you a one-year "subscription" to Bungie Pro for a planned 750 Points. Buy this, and for the following year, your file share will balloon to 24 slots and 250MB. At the end of the year, you'll be asked to either re-subscribe, or else bring your share back under the default limit before you can upload new content. (750 Points comes to about 78 cents per month, by the way.)