I assume that quarter of a roll of TP has the cardboard inner taken out

Disclaimer: had to run an multi-stage ultra in the sahara, weighed everything, finished with 1xpacket of carbs+hydration that was right at the bottom of the bag, was upset with myself that I didn't use it for the last day. That's like almost 200 calories I could have used to keep myself warm at night (the desert gets cold at night).