Glyphscape/Carrying items

Carrying items basics
Your ability to carry items is determined by your single highest skill level in any of the 16 skills that RS3 offers. This is your "highest level".

Certain items increase your effective highest level for the calculations below. These are given by various tassles. There are ways to increase your effective highest level above 100.

Inventory space
You are able to carry an infinite amount of stackable items, but different stackable item types, and different individual nonstackable items, each take up their own slot. At a highest level of 0, you will be able to carry 8 items (since you will have 8 slots). For every six increases in your highest level, you gain 1 inventory slot (ie. 9 slots when your highest level is 6, 10 slots when your highest level is 12, etc.). At level 96 you have the maximum number of slots that you can naturally obtain, at 24 slots.

Certain items may directly increase your inventory space. A backpack, when equipped, gives you an additional 2 inventory slots.

Weight
For the following calculations, include items you have in your inventory and items you have equipped.

The maximum amount of weight you can carry and still move about (walk) is (your highest level + 20) kg. At a highest level of 100, you can carry 120 kg worth of items and still walk.

The maximum amount of weight you can carry and still run is (your highest level / 2 + 10) kg. At a highest level of 100, you can carry 60 kg worth of items and still run.

The maximum amount of weight you can carry and still swim is (your highest level / 4 + 10) kg. At a highest level of 100, you can carry 35 kg worth of items and still swim.

Stamina
Stamina determines how much you can run. Your highest level determines your max stamina:

Max stamina = highest level * 100.

You regenerate stamina when you are not running or swimming, at the rate of (highest level *1) per second. You use up stamina when you run and swim, at the same rate. This stamina drain is proportional to your weight carried + 60 kg (your weight) and is equal to this amount * 2 per second. At a highest level of 100, your max stamina is 10,000, you regenerate 100 stamina each second, and if you're carrying 60 kg, you use up 240 stamina each second. Hence the higher your highest level, and the less you are carrying, the longer you can run. It's same for swimming.