This years empty model is 4 oz. This includes the outside packaging, the "main event" bag, the zip-lock bag, TP, and disinfectant wipes. You could rid of any repeat personal items.
But why don't you just filter water more often and carry less of that??
My two girlfriends and I just finished summitting, hauling 45-50lbs packs for a week from Cottonwood Lakes. What's a couple ounces?
bumps