The player's inventory is used to hold items. Any item picked up by the player from off the ground or retrieved from out of a chest will enter the player's inventory until it is full, at which point items will no longer be picked up by the player, and will fall to the ground if quick grabbed from a chest.
The character begins with 30 free inventory slots (not including the 3 sets of worn armor and accessories slots), but can increase that amount up to 50 with certain bags, like the Octarine Bag or Morpha's Bubble Bag.
In addition to the inventory spaces, a character has three sets of worn item slots, which include: