SAFETY ADVICE: This instructable uses sharp tools. Be careful using them. If you are not sure how to use, don't continue. NOT SUITABLE FOR KIDS.
Step 1: Tools and materials
1 - Thick cardboard.
2 - String.
3 - Rule and cutter.
4 - Scissors and awl (or similar).
5 - Pencil or marker.
6 - Glue and packing tape.
7 - Cutting mat (or another cardboard).
You will need a strong cardboard (two layers is recommended). Cardboard need to be 300 x 30 cm, but no in one piece.
Step 2: Marking and cutting cardboard
- One for sides: 100 x 30 cm.
- Three for internal part: 50 x 30 cm.
- One for base: 45 x 30 cm.
and cut them. Also, trim the flaps (those of 5 cm width). Be careful: if you want a clean final look, work always on printed side of cardboard.
Using rule and cutter score the dotted lines, and fold cardboard. I recommend you to cut one layer and put pressure with scissors before folding.
The width of 30 cm. will fit for common wine bottles. If you want they protrude, reduce it to 25 cm or so.
Step 3: Making internal part
Then sew the three prism by the edge with the flaps. For that, make three holes on each prism: one at the left, another at the right and another at the middle of an edge, but not exactly on the edge. Then pass the string through the holes and tie it.
Be careful with awl, because cardboard is stronger than you think...