Google is adding more robust searching to Gmail today, in the form of searching by size and date. If you want to search by size, type in size:5m or larger:5m, using the example of 5 MB, into the search box. The same goes for date. You can type in older_than:1y for emails older than a year. While it’s not quite ideal to be typing these unnatural terms to search, I’m glad such robust options are available to us. Hopefully Google can eventually add them to a UI for searching.