Final answer:
Ernie Frazee invented the pull-tab can in 1959, which was designed to open a beverage can without the need for an additional opener, making it more convenient to enjoy drinks from cans.
Step-by-step explanation:
The invention prompted by not having an opener for his beverage at a picnic in 1959 was the pull-tab can. This invention by Ernie Frazee was significant because it eliminated the need for a separate can opener when wanting to enjoy canned beverages outdoors or in settings where an opener might not be readily available. The pull-tab is a small, built-in device on a beverage can that, when pulled, opens the can by creating an opening in the lid of the can, thus allowing the beverage to be consumed directly from the can.