PF.2e Bulk Capacity and Clumsyness

Bulk Capacity and encumberance

Carrying especially heavy or unwieldy items can make it more difficult for you to move, as can overloading yourself with too much gear. The Bulk value of an item reflects how difficult the item is to handle, representing its size, weight, and general awkwardness. If you have a high Strength score, you usually don’t need to worry about Bulk unless you’re carrying numerous substantial items.
You can carry an amount of Bulk equal to 5 plus your Strength modifier without penalty; if you carry more, you gain the encumbered condition. You can’t hold or carry more Bulk than max 10 plus your Strength modifier.

Encumberd

When you are carrying more weight than you can manage. While you’re encumbered, you’re clumsy 1 and take a 10-foot penalty to all your Speeds. As with all penalties to your Speed, this can’t reduce your Speed below 5 feet.
(clumsy is a status penality that applies to AC, Dex-Saves, Reflex-Saves, Acrobatics, Thievery and Stealth)

Bulk Values and Item Bulk Type

An item that weighs 5 to 10 pounds is 1 Bulk, an item weighing less than a 3 ounces is negligible, and anything in between 5/10 pounds and 3 ounces is light. Big items might have higher Bulk values.
For example, a 10-foot pole isn’t heavy, but its length makes it difficult for you to move while you have one on your person, so its Bulk is 1. Items made for larger or smaller creatures have greater or lesser Bulk, as described in Items and Sizes.

Bulk of Doubloons

Doubloons are a popular means of exchange due to their portability, but they can still add up. A thousand doubloons of any denomination or combination of denominations count as 1 Bulk.
It’s not usually necessary to determine the Bulk of doubloons in fractions of 1,000; simply round down fractions of 1,000. In other words, 100 coins don’t count as a light item, and 1,999 coins are 1 Bulk, not 2.

Bulk By Size

You might need to know the Bulk of a creature, especially if you need to carry someone off the battlefield, but the GM might adjust this number.

Size of Creature	Bulk Amount
Tiny	1
Small	3
Medium	6
Large	12
Huge	24
Gargantuan	48

Pathfinder 2e
Source Core Rulebook pg. 271-272 & 619 4.0