[Lvminary]

Hey all I just wanted to know what I can learn from the community here about export settings. Now I know this is a broad topic but let me first start by saying that I export in 44.1khz and 16bit as I should. The concerning thing for me was that all my MP3's come out around 10mb or under 14mb. Sounds normal? Well I've seen mastered songs MP3's around 3.5mb or under 10mb and I thought how do I get that same quality and use up as little space as possible? Pro tools 12 btw. Thanks for reading, genuinely curious.