A pair of full metal scissors. It's an old little pair, an indispensable tool in my desk. The ones with plastic handles [modern] are not recommended because at times, we get thick areas to cut. So with hard pressure, the handles may snap. I have grown up with this pair of scissors and my favourite. It has done thousands of dollars of work for me! I'll try to look for an image of it later. Some plastic bottles are thin and those can be cut with normal craft scissors, but one has to be careful not to use if too much pressure is needed.
Sorry I did not think of it while writing the piece. It never occurred to me that someone may ask!!