You don't need a small shovel a rapidly spinning off road tyre can make the hole and fill it for you afterwwards
- as long as your GS still starts - sorted
It doesn't say anything about the volume of the poo bags
It'd be pretty difficult to try changing bags in the middle of an apres-Guiness fueled-night-before-in-the-morning-let-goes-resembling-pebble-dash-decorating