Image by Getty Images via DaylifeVery simple, just put peanut butter on both slices of bread. This basically waterproofs the bread for you. Now when you put the jelly on, it will stay isolated between the layers of peanut butter all day long!! Enjoy a fresh non-soggy sandwich any time of the day. This does, however tend to make the jelly squeeze out the sides fairly easily, so I find that leaving a half inch of peanut butter around the edge makes a good way to seal the two pieces of bread together using the peanut butter as an adhesive.