Recently for the last few months I have been hitting the maximum capacity of Gmail. I tried going through and cleaning up my mail box but I just ended up making up excuses and keeping the emails, I never really want to delete any emails. So I decided to do two things, one is to upgrade my mailbox and secondly is to really go through it and sort it out. So I went for the $5 plan since it really cost nothing and more then triples my regular capacity, and I ran FindBigMail on my mail box which sorted out my big files and I got to see I had a lot of junk emails that could be deleted that I was reluctant too but it was really junk.
Gmail Storage Upgrade Packages:
Link: FindBigMail