How can I bind and use Pocket Items in Fortnite Zero Build?

Pocket Items are unlimited-use items with cooldowns that boost mobility and survivability:

• Choose from Shockwave Grenades, Med Mist Grenades and Shield Bubbles;
• Swap your equipped Pocket Item at Vending Machines around the map.

The key bind is set to Switch Mode on keyboards and to Switch Mode / Edit (Hold) on controllers.