I prefer the roasting bags for compact emergency water containers. Cord or cord plus a little duct tape extends their utility. Like all the "last resort" equipment, it's best to experiment with it in realistic conditions to winnow out what works and what does not work for you.<br><br>BTW, try rolling the bags for your PSK - in my opinion they are just as compact as folded (albeit differently shaped) and seem to be less likely to develop "storage leaks" from creases.