If you are remotely curious...
10 slots of storage.
All of which are only useful for reasons that do not involve practical storage. Plaques, Rifle Racks, and Trophy Cases display the item put in them.
The Friendly Sentry, Neutral Sentry, and Hostile Sentry aren't classified as Item Storages. Instead, they are Robotic Turrets. They can shoot things when powered if it has a Ranged Weapon in it.
- Birch Plaque: 5x2 = 10 slots
- Birch Rifle Rack: 5x2 = 10 slots
- Birch Trophy Case: 5x2 = 10 slots
- Maple Plaque: 5x2 = 10 slots
- Maple Rifle Rack: 5x2 = 10 slots
- Maple Trophy Case: 5x2 = 10 slots
- Pine Plaque: 5x2 = 10 slots
- Pine Rifle Rack: 5x2 = 10 slots
- Pine Trophy Case: 5x2 = 10 slots
- Metal Plaque: 5x2 = 10 slots
- Metal Rifle Rack: 5x2 = 10 slots
- Metal Trophy Case: 5x2 = 10 slots
- Friendly Sentry: 5x2 = 10 slots
- Neutral Sentry: 5x2 = 10 slots
- Hostile Sentry: 5x2 = 10 slots
12 slots of storage.
- Cooler: 4x3 = 12 slots
16 slots of storage.
- Birch Counter: 4x4 = 16 slots
- Birch Counter Sink: 4x4 = 16 slots
20 slots of storage.
- Maple Counter: 5x4 = 20 slots
- Maple Counter Sink: 5x4 = 20 slots
24 slots of storage.
- Birch Crate: 6x4 = 24 slots
- Pine Counter: 6x4 = 24 slots
- Pine Counter Sink: 6x4 = 24 slots
- Fridge: 4x6 = 24 slots
25 slots of storage.
- Birch Wardrobe: 5x5 = 25 slots
28 slots of storage.
- Maple Crate: 7x4 = 28 slots
- Metal Counter: 7x4 = 28 slots
- Metal Counter Sink: 7x4 = 28 slots
30 slots of storage.
- Maple Wardrobe: 5x6 = 30 slots
32 slots of storage.
This is where stuff starts getting to be a bit more practically useful.
- Pine Crate: 8x4 = 32 slots
35 slots of storage.
- Pine Wardrobe: 5x7 = 35 slots
36 slots of storage.
- Locker: 6x6 = 36 slots
42 slots of storage.
- Metal Wardrobe: 6x7 = 42 slots
49 slots of storage.
This is the most storage you can get from an Item Storage. However, you can't really just use a Carepackage as storage considering it'll just poof after a while, so... Metal Wardrobe is the most.
- Carepackage: 7x7 = 49 slots