I've uploaded my app to the itunes connect and am using TestFlight before I release my app. When i check my build it gives me a warning about the "Universal" Device type being over the 100 mb mark for the app to be downloaded over a network connection. All the rest are around the 60MB mark.
I tested on my device, iphone 6 running 9.2.1. and in testflight it shows the app as being the correct size. But on another device iphone 6 running 8.2 it displays the Univeral size 149 and actually downloads it as that size. I don't why firstly the universal size is twice the size and secondly why is the iphone 6 running 8.2 downloading the Universal app.
Sorry i don't currently have a screen shot of the other device. but it has 149MB as the size