How do you get more inventory spaces?

[Uncle Jon]

I maxed out at 60 for the inventory, how do you get another tab for inventory stuff?

[Fel]

You will find inventory slots in multiple features, the earliest being itopod's perks, then quirks and wishes.

It isn't something you can afford until you grabbed most of the useful stuff but the AP store has quite a few inventory slots as well (the cost goes up as you get more so it's a waste of AP early on but later when you don't really have much to get from there anymore it's a good way to sink a lot of AP for something useful).

[CortJstr]

Completing No Equip challenges also gives inventory slots.

[Dopey Shepard]

Originally posted by Darunia:

I maxed out at 60 for the inventory, how do you get another tab for inventory stuff?

Early on, buy some slots with EXP, or buy a 10 pack for 12 inventory slots (but don't buy those slots with AP, save AP for hearts instead)

[N0ma13]

No equips will give a total of 50 slots. Takes 3-4 days to do all 5.

[Fel]

The time it takes to do that challenge depends on how long you wait before doing it, if you are patient enough to wait until after UUG you can clear each in a significantly lower amount of time (not from the equipment of course but from having higher stats and more features boosting your progress).

[N0ma13]

As with all challenges in this and most idlers, though you also don't get the benefits from them until later and they lose the meaning of their name.
When 50 inventory slots in 3 days means something to you is when you should probably do that set.
I know I know. Meta. Golden path. W/E. Games are supposed to be fun so do the challenges when you feel you'll benefit from them.
I only mentioned them because it's the quickest way to gain that many slots without paying, at the point in the game it's being asked.