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Professional-grade food wrap would be ideal, but you can use basic saran wrap for this as well. Don't worry about being too precise when it comes to the size of the plastic, however; you'll be stretching and trimming it later.  This method is not recommended for hot or cold process soap, as that type of soap needs to “breathe.” This method is great for melt-and-pour soap. Place the plastic wrap on a flat surface and smooth out any ripples. Set the soap face-down on top, making sure that it is centered. If this is a rectangular bar of soap, make sure that one of the long edges is facing you. This is a little like wrapping a gift. Take the top edge of the plastic wrap, and bring it over the top edge of the soap. Pull it tight enough so that it clings to the soap. The plastic wrap shouldn’t go past the bottom edge of the soap. If it does, trim it off. Make sure that the top edge is smoothed down first. If it isn’t, then take a moment to smooth out any wrinkles with your fingers. Next, take the bottom edge and pull it tightly across the back of the soap, just like you did with the top edge.  Again, the plastic shouldn’t go past the top edge of the soap. If it does, cut the excess off. Make sure that you smooth down the bottom edge against the plastic wrap. It should cling to it. Do the left side first, then the right. Make sure that you pull them tight enough so that they stretch and stick to the plastic that’s already around the soap.  Like with the top and bottom edges, the plastic shouldn’t extend past the side edges of the soap. You can trim these edges shorter so that they touch in the middle instead of overlap. While not absolutely necessary, this will help cover up the seam as well as ensure that it doesn’t come undone. A piece of tape is all you really need, but a label can give your soap a professional touch. For example:  If you own a store, you could print out your logo and use that as a sticker label. If you are selling your soap, consider printing out an ingredient label and using that instead of tape.

Summary:
Cut a sheet of plastic wrap 3 times larger than your soap. Set the soap on top of the plastic wrap. Stretch the top edge of the plastic wrap over the top edge of the soap. Pull the bottom edge of the plastic over the bottom edge of the soap. Bring the left and right sides of the plastic wrap over the soap. Secure the side edges with a piece of tape or a label.