Bottle cap (Fallout Shelter)

Bottle caps are the currency in Fallout Shelter. The maximum amount of caps is 999,999. After that, caps collected from any other source except lunchboxes will be wasted.

Uses
Bottle caps can be used to:
 * Build or apply upgrades to any room to expand the vault.
 * Customize any dwellers' hairstyle, hair color and facial features in the Barbershop.
 * Craft weapons and outfits in the weapon and outfit workshop, respectively.
 * Bring back dead dwellers, except in Survival mode.

Earning caps
Bottle caps can be earned by:
 * Collecting resources from a production room.
 * Rushing a production room successfully.
 * Sending a dweller or Mister Handy to explore the wasteland.
 * Killing, then looting raiders.
 * Selling weapons or outfits.
 * Leveling up a dweller (The amount of caps rewarded equates to the dweller's new current level.)
 * Leveling up dweller stats at training rooms.
 * Completing objectives.
 * Receiving them in lunchboxes or in a starter pack, in units of 100, 500 or 3,000. Caps from lunchboxes add-up even when 999,999 caps has been reached.
 * Finding and selecting the Mysterious Stranger.
 * Receive from Bottle & Cappy when they stop and dance.
 * Collecting them from the Daily Report.