.... hold 20 rolls of toilet paper each, 5x packs of 4 rolls = 4,000 sheets. 2 panniers = 8,000 sheets in total. The rear Vaude Aqua Pluses can hold 24 rolls of toilet paper each, 6x of the same packs as they have a slightly more square shape rather than tapered toward the bottom as are the Roller Classics and are marginally larger. So 4800 sheets each pannier, 9600 in total. Both panniers can still be easily roll closed and made water tight. Just thought I would share this with you .