Encumbrance

Encumbrance gives all items weight, which affects how many items players can carry. If a player has too many items, they might move much slower or be completely unable to move. This feature can be toggled under Server Settings in the Drafting Table GUI, as well as encumbrance start and end values (described in detail below).

A player's total weight can be viewed in the Personal Inventory GUI, accessed via a keybind you set up in your Options window, or by viewing an item's / brick's / vehicle's inventory. The weight of each item can also be viewed in any inventory window by selecting the item stack (weight is marked with a blue "weight" icon); the amount of items in the stack isn't taken into account.

Start Weight
You can set up encumbrance to gradually slow down players after passing a certain weight limit ("Start Weight"), and as they take on additional weight. Once the start weight limit is passed, players will begin to slow down more and more as they carry more items (relative to the "Max Weight" limit). If players are under the Start Weight limit, they won't be slowed down at all, no matter how many items they have.

Max Weight
You can also set up a "Max Weight" limit, which will prevent players from being able to move completely once surpassed.

The Start and Max weight limits can then be used in unison to have players gradually slow down after a certain limit, and then be unable to move after having their weight maxed out. You can also set up encumbrance to simply prevent players from being able to move after a certain limit (without gradually slowing down), by setting the Start and Max limits to the same value.