Start by removing any moldy, crushed, or spoiled berries from the bunch as these will quickly cause the others to decay. Line the bottom of a clear, sealable container with a piece of paper towel, then loosely layer berries, making sure to put another piece of paper towel down before adding the next layer. Do not wash berries until they are ready to be eaten as the excess moisture can cause molding.
Freeze berries that are starting to soften, before they go bad. Frozen raspberrries crumble easily into sweet, crunchy gems. They are a great addition to smoothies, oatmeal and yogurt.