What is an flexible container with a opening at the top?

A flexible container with an opening at the top typically refers to a bag or pouch, such as a tote bag, plastic shopping bag, or a fabric sack. These containers are designed to hold various items and may be made from materials like plastic, fabric, or paper. The open top allows for easy access to the contents, making them convenient for carrying groceries, personal belongings, or other goods. Examples include reusable shopping bags and drawstring backpacks.