It stead of using water in the bags use brine, so if it leaks it leaks brine onto the kraut and it will be the same as the liquid in the kraut.
Im hoping to this year do my kraut in 1/2 gallon mason jars with air locks, i used to do it in a 5 gallon buck and set it in the corner of the dinning room but it gets in the way and the smell can be a little discouraging sometimes.....