I use Bribie's socks (from Craftbrewer, models own, , ™, no affil... etc, etc). However, recently my hop additions have waaaay exceeded the 200g mark and it got decidedly viscous in there. I think I lost quite a bit of bitterness and flavour - i can still dry hop... or even Isohop... However I reckon as a rule of thumb, no more than 100g in one of Bribie's socks... :huh:...
I'm talkin' pellets here - Flowers or plugs just get chucked in, barefoot.
Yes I rarely use more than 60g, but in a high hop brew I boil the bittering hops for an hour, empty the hop sock then boil the later additions. Because the sock is suspended from the skyhook and sits just above the exposed element of the Birko Urn, they get a good rousing.