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@atk
I've got a couple of weights of xpac, was going to use a combination of the heavier weight and 1000d cordura for the 'butt' of it and the lighter weight for the rolling part. Cordura will be fairly minimal, just for reinforcement at contact points with the seat post and saddle rails. Will almost a dead rip-off of the older style Revelate bags to see how things fit before worrying about added attachments or weight saving
I don't know about big balls, I think I've still got a couple of kilos of spare fat left insulating my core...