"Side pockets" typically refers to hidden or undisclosed funds or assets that are separate from the main or publicly known accounts. It implies having reserves or savings that are kept secret for personal use or certain purposes. Full definition
Includes exterior mesh side pocket for a drink, insulated interior, interior mesh pocket, and carrying handle. (gatortots.com)
It's lined with side pockets and an invisible back zipper. (extrapetite.com)
A small Bluetooth device is connected to the fabric sensors and placed in the shirt's built in side pocket, which holds the device securely for real - time tracking. (digitaltrends.com)