Lightweight and environmentally friendly glasses made from empty plastic bottles.
Step 1: Marking the Bottle
Take the razor blade and mark where to want to cut. I just slightly indented around the circumference.
Sorry, the picture turned out to be upside down.
Step 2: Cutting the Glass
Cut along the line. I used these pointy scissors, as they worked the best. You can sand the rough edge if you want to. Tighten the cap on the bottom and it will hold any liquid really well. Enjoy