I'm not sure about bandwidth limits, but https://www.copy.com/home/ offers 15gb free, with an additional 5gb (to both people) if you sign up using a referral link (https://copy.com?r=i1A6aK). I have tested it with a modpack, and, while direct links are a little clunky to get(very similar to dropbox), they do work.
List of good places to host your modpack file
in Platform Pagoda
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I'm not sure about bandwidth limits, but https://www.copy.com/home/ offers 15gb free, with an additional 5gb (to both people) if you sign up using a referral link (https://copy.com?r=i1A6aK). I have tested it with a modpack, and, while direct links are a little clunky to get(very similar to dropbox), they do work.