It'd be useful to be able to restrict which wormholes are included in routes based on their total (throughput) mass.
For instance, you might want to further narrow the "Large" restriction to only Ls or VLs with 3 Mt of throughput or more. This would rule out 36 L and VL holes which have between 2 and .75 Mt of throughput.
Or you might want any Medium or larger but with at least 1 Mt of throughput.
Or you don't care about Size at all but want at least .75 Mt to go through.
And so on...
I list all the stats here, and they're in the SDE as well. There are currently eight different total throughput mass groupings in EVE, here in Megatonnes: