Three inventory slots sounds fine until you're juggling fish, clams, a weapon, and whatever random item the ocean just threw at you. How to Fish hits that wall fast, and the game doesn't exactly advertise that a fix exists. The good news: you can expand your carrying capacity, and it doesn't cost much. The catch is that you have to earn it first.
How does inventory work in How to Fish?
You start the game at the Lighthouse with just 3 inventory slots. That's enough to get oriented, but the moment you start exploring seriously, those slots fill up in seconds. Fish take space, weapons take space, and any useful loot you find competes with everything else you're already carrying.
The game does not give you any inventory upgrades in the starting Lighthouse area. No amount of poking around the Lighthouse shop will change that. The upgrades are gated behind island progression, which means you need to move the story forward before your pockets get any deeper.
How to Fish Guide: How to Get More Inventory Slots
What do you need to do before unlocking more inventory?
Before you can buy your first extra slot, you need to reach the second island, and that requires the boat. The Lighthouse Keeper won't hand over the boat keys for free. You'll need to complete the Who Stole My Beer quest, which involves tracking down and defeating the Spider Crab, the first boss in the game.
Once the Spider Crab is down, the Lighthouse Keeper rewards you with the boat keys. From there, you can sail to the second island and finally start addressing that inventory problem.
How to unlock the first extra inventory slot (island 2)
When you land on the second island, head straight to the shop. The shopkeeper there stocks a small selection of items, and among them is your first inventory upgrade. The price is $5, which is about as cheap as upgrades get in this game.
Buying it bumps you from 3 slots to 4. That extra slot matters more than it sounds when you're actively exploring and trying to hold onto everything at once.
How to Fish Guide: How to Get More Inventory Slots
How to unlock the second extra inventory slot (island 3)
The third island carries the next upgrade. The process is the same: reach the island, find the shop, and buy the slot. This one costs $10, double the price of the first.
Progressing to the third island means dealing with more of the game's content along the way, including additional bosses. If the Blue Shark on island 3 is giving you trouble before you can even reach the shop, that guide covers the full fight and unlock sequence.
How to Fish Guide: How to Get More Inventory Slots
What's the fastest way to get both upgrades?
The most direct path runs like this:
- Complete the Who Stole My Beer quest at the Lighthouse
- Defeat the Spider Crab to earn the boat keys from the Lighthouse Keeper
- Sail to the second island and buy the $5 inventory slot from the shop
- Continue progressing through the second island's content
- Reach the third island and buy the $10 inventory slot from that shop
Neither upgrade requires grinding for cash specifically. $5 and $10 are small amounts that most players accumulate naturally through normal play. The real cost is time spent progressing through the islands, not money.
Why does inventory space matter so much?
After testing different loadouts across multiple islands, the inventory limit is one of the most felt restrictions in the early game. Three slots forces constant decisions about what to keep and what to drop, and those decisions get harder as the game introduces more item types. A fourth slot changes the math enough that exploration feels noticeably less stressful.
If you're chasing achievements alongside your inventory upgrades, the How to Fish trophy and achievement guide maps out the most efficient unlock order so you're not backtracking unnecessarily.
For everything else the game throws at you, the full How to Fish guides collection has boss breakdowns, progression tips, and more to keep you moving forward.