These are the plastic loops, known as plastic packs wrangler, to hold on to the half dozen of canned drinks.
Pictures taken from Happy Feet.
See thats it`s strangling the penguin where the penguin can get stuck to without being able to remove it himself.
With all the plastics being thrown into the drain, sewer or even on the floor, it might cause harm to other living things and pollute the waters. Just because it`s not doing harm to us human doesn`t mean that we can do whatever we like.
Even so these images are from a cartoon, what we are trying to say is that all these inconsiderate actions of throwing all sorts of litter not into proper bins may cause all sorts of consequences. Do the right things and throw the plastics into proper bins or even recycle bins!
TSS.