Weight

Weight is a gameplay mechanic that dictates how much space in your Bag certain materials take up. For example, Logs have more weight than Leaves do, so they will take up more space.

Explanation
Weight how much space an item takes up in a bag (or how many space "points" it takes). Higher tier ores and resources will usually fill more space than previous tiers, eg. Pink Diamonds take the most amount of space than any other item, whereas your starting rock takes no space.

Trivia

 * The more weight you have, the faster you sink in water. This, in turn, makes going to the Underwater Caves faster.
 * In the update, Meteors, Soybeen buffed the weight of food items, making them weigh much more (especially bloodfruit). This prevents overstocking food sources for healing in PvP, balancing food in general.
 * You can still have a lot of food items, though, if you have a large Bag.
 * Tools and Armor don't have any weight, and thus, take up no space in your inventory.(as of now, thesse things weigh as well
 * Currently, the War Hammer is the heaviest tool that is craftable.