In the early game of "Stardew Valley", the player's inventory backpack only has 12 slots. If the player wants the back to be full, he can upgrade the backpack. The backpack can be upgraded twice in total, and the maximum capacity can be expanded to 36 slots.
Answer: Players can expand the capacity of the backpack .
1. When the game first starts, the backpack in the player's inventory only has 12 slots, but the player can upgrade the backpack twice, expanding the capacity to a maximum of 36 slots.
2. Players can purchase backpack upgrades at Pierre's grocery store. Upgrading the backpack only requires enough gold coins, and no other additional conditions are required. It can be purchased after starting the game.
3. "Large Backpack" (red ) costs 2,000 gold and can expand the inventory to 24 slots.
4. "Luxury Backpack" (blue) costs 10,000 gold and can expand the inventory to 36 spaces.