Sand is often added to arid potting mixes to increase drainage. Sand can also be used in terrariums and other arrangements as a drainage layer.
Pre-bagged sand comes in a resealable bag.
If you are shopping in-store you can buy sand by the scoop (1L per scoop) and take them home in your own reusable container.
Bring your own container to fill and save 10% on all soil bar products.