it would depend on the size of the bottle
It depends on that specific bottle. There is no standard weight.
An empty 5-gallon glass bottle typically weighs around 5-7 pounds.
An empty 16.9 oz. plastic water bottle weighs approximately 0.6 ounces.
An empty 500 ml plastic bottle typically weighs around 10-15 grams.
A typical empty 5-gallon plastic bottle weighs around 1-2 pounds.
2lbs 7.2 oz
An empty plastic 2 liter pop bottle typically weighs around 40-50 grams.
An empty R421A refrigerant bottle typically weighs around 7-8 pounds. Therefore, a 25 lb R421A empty freon bottle would weigh approximately 32-33 pounds.
@ 4 degree Celsius it should wait with the empty bottle around 2.3 kg
Well that depends on what you made the bottle out of and how much of that material you used. But the water inside would weigh approximately 473 grams (roughly 1 pound) depending on certain environmental conditions
This experiment you may easily perform yourself. Just collect a number of caps, weigh them, and divide that weight by the number of caps in the group.