How many pockets do I actually need on a gravel jersey?

Four is the practical minimum for most gravel riders: three standard pockets plus one zippered pocket for your phone, keys, or wallet. Five or more pockets are valuable for bikepacking, ultra-endurance events, or riders who prefer not to use frame bags. If you typically ride with a hydration pack or frame bag, three pockets may suffice, but you will still miss the zippered security pocket on rough terrain.