Summarize this article in one sentence.
Pull apart the box’s sides to separate them. Fold the flaps on both ends to get the box into shape. Then choose 1 end to seal with packing tape. Tape along the seams to ready the box for packing. For shipping, use corrugated cardboard boxes. These boxes are double-walled, so they’re stronger than regular boxes. The tray is similar to an egg carton, dividing the box into cells that hold containers in place. It’s a useful option when you plan on sending multiple items. They can be purchased from moving and shipping companies, but many liquor stores can give you some for free if you ask nicely.  Foam trays are another option. These trays come in various sizes to hold all sorts of containers. If you are using a specialty wine box, the tray will already be in place. Wrapping paper or newspaper is usually enough protection with a tray. Roll the paper around each container as tightly as possible. To be safe, you can also wrap the containers in bubble wrap.  When shipping multiple containers, wrap each one individually. Use rubber bands or packing tape as needed to hold the wrapping in place. If you have a tray, this part is easy. Slide the container into the tray’s cell, squeezing the wrapping as needed to fit it. Keep the lid or cap end pointed upwards. Double-check that the container is wedged in place with its cap on securely. Repeat this with any other containers sent in the same package. If you choose not to use a tray, lay the container in the center of the box. Keep it away from the sides as much as possible. Stuff the packing peanuts, bubble wrap, or air bags into the package as needed. Use them to eliminate any leftover space, such as between the container and the wall. Also add cushioning above the container as needed. The extra padding can make the difference between a broken container and successful shipping. Fold the box’s top flaps together. Tape along all the seams. Attempt to lift the flaps to check how well they are taped down. Cover over any loose spots with additional layers of tape to ensure your package doesn’t open up in the delivery person’s hands! Find a black permanent marker. On the top side of the box, write “Liquid” and “Fragile” in capital letters. In fact, write it several times all over the box to make your point. Then, take the box to the shipping company. Have them print out a label and place it on the top of the box. Labeling the contents as liquid or fragile does not guarantee that the box will arrive in 1 piece, but it may alert a carrier about to handle the package roughly.

Summary:
Assemble and tape shut the bottom of a corrugated box. Set a cardboard tray inside the box for easier packing. Wrap the container of liquid in paper. Place the container of liquid into the box. Fill the extra space around the container with filler material. Tape the box shut with packing tape. Label the box to show it contains liquid.