I've been collecting Omnispell Dust. Every time I see it on the AH for a not unreasonable price, I make a bid. Over the last few years, between the AH and the odd drop, I've collected 5,102 Omnispell Dust.
It weighs 51lbs. That's insane!
After seeing this, I checked the weight of my usual reagents. I top up to 1,000 each when I do my personal admin. However, this means that my Wizzy caries around nearly 90lbs in reagents!
No wonder she burdens so easily.
However, the Omnispell dust is pretty much a store bought item. It should be much lighter than the in-game stuff. C'mon!
I think I'm just going to waste a feat and the SP on Eschew Materials.