What is the maximum filesize for filepacks in the addon system?

I assumed, it'd be 30 MB, so I stripped down my packages to at most 30 MB (27,6 MB to be precise). But still, all I get is a http error 413 (request entity too large). Is there only a file limit or even a "version limit" (the sum of all filepacks for all platforms)?

Would be nice, if users could see this max size on the upload page. It's very frustrating uploading 5 files with small bandwidth only to be greeted with a http error.