Putting the issue of patching aside, if it's likely that you will need five spare tubes on your trip allow me to suggest that you invest in some better tires, especially if you are not going to patch. I once spent nearly four months on tour. I got a grand total of three flats. Seven weeks in Spain generated one flat. An eight week tour out west featured no flats. Nine days in Montana that included some sixty miles of unpaved surfaces, some of which were rocky. No flats. Other trips ranging from three to eight days with no flats. I did flat on a three-day trip maybe four years ago and broke a valve stem while topping off a tire during another nine day trip. I think that's about it.