diff --git a/src/items/Inventories.cpp b/src/items/Inventories.cpp
new file mode 100644
index 00000000..0b1ac2dc
--- /dev/null
+++ b/src/items/Inventories.cpp
@@ -0,0 +1,42 @@
+#include "Inventories.h"
+#include "../world/Level.h"
+#include "../world/World.h"
+
+Inventories::Inventories(Level& level) : level(level) {
+}
+
+Inventories::~Inventories() {
+}
+
+std::shared_ptr<Inventory> Inventories::create(size_t size) {
+    int64_t id = level.getWorld()->getNextInventoryId();
+    auto inv = std::make_shared<Inventory>(id, size);
+    store(inv);
+    return inv;
+}
+
+std::shared_ptr<Inventory> Inventories::createVirtual(size_t size) {
+    int64_t id;
+    do {
+        id = -std::max(1L, std::abs(random.rand64()));
+    } while (map.find(id) != map.end());
+
+    auto inv = std::make_shared<Inventory>(id, size);
+    store(inv);
+    return inv;
+}
+
+void Inventories::store(std::shared_ptr<Inventory> inv) {
+    map[inv->getId()] = inv;
+}
+
+std::shared_ptr<Inventory> Inventories::get(int64_t id) {
+    auto found = map.find(id);
+    if (found == map.end())
+        return nullptr;
+    return found->second;
+}
+
+const inventories_map& Inventories::getMap() const {
+    return map;
+}
diff --git a/src/items/Inventories.h b/src/items/Inventories.h
new file mode 100644
index 00000000..9ad30343
--- /dev/null
+++ b/src/items/Inventories.h
@@ -0,0 +1,39 @@
+#ifndef ITEMS_INVENTORIES_H_
+#define ITEMS_INVENTORIES_H_
+
+#include <string>
+#include <memory>
+#include <unordered_map>
+
+#include "Inventory.h"
+#include "../maths/util.h"
+
+class Level;
+
+using inventories_map = std::unordered_map<int64_t, std::shared_ptr<Inventory>>;
+
+/* Inventories runtime storage */
+class Inventories {
+    Level& level;
+    inventories_map map;
+    PseudoRandom random;
+public:
+    Inventories(Level& level);
+    ~Inventories();
+
+    /* Create new inventory with new id */
+    std::shared_ptr<Inventory> create(size_t size);
+
+    /* Create runtime-only inventory (has negative id) */
+    std::shared_ptr<Inventory> createVirtual(size_t size);
+
+    /* Store inventory */
+    void store(std::shared_ptr<Inventory> inv);
+
+    /* Get inventory by id (works with both real and virtual)*/
+    std::shared_ptr<Inventory> get(int64_t id);
+
+    const inventories_map& getMap() const;
+};
+
+#endif // ITEMS_INVENTORIES_H_
diff --git a/src/items/Inventory.cpp b/src/items/Inventory.cpp
index e414d152..e844d18b 100644
--- a/src/items/Inventory.cpp
+++ b/src/items/Inventory.cpp
@@ -2,7 +2,7 @@
 
 #include "../content/ContentLUT.h"
 
-Inventory::Inventory(uint id, size_t size) : id(id), slots(size) {
+Inventory::Inventory(int64_t id, size_t size) : id(id), slots(size) {
 }
 
 ItemStack& Inventory::getSlot(size_t index) {
diff --git a/src/items/Inventory.h b/src/items/Inventory.h
index e24fd3df..6185f07d 100644
--- a/src/items/Inventory.h
+++ b/src/items/Inventory.h
@@ -14,10 +14,10 @@ class ContentLUT;
 class ContentIndices;
 
 class Inventory : Serializable {
-    uint id;
+    int64_t id;
     std::vector<ItemStack> slots;
 public:
-    Inventory(uint id, size_t size);
+    Inventory(int64_t id, size_t size);
 
     ItemStack& getSlot(size_t index);
     size_t findEmptySlot(size_t begin=0, size_t end=-1) const;
@@ -40,10 +40,14 @@ public:
 
     static void convert(dynamic::Map* data, const ContentLUT* lut);
 
-    inline uint getId() const {
+    inline int64_t getId() const {
         return id;
     }
 
+    inline bool isVirtual() const {
+        return id < 0;
+    }
+
     static const size_t npos;
 };
 
diff --git a/src/logic/scripting/LuaState.cpp b/src/logic/scripting/LuaState.cpp
index 2ae3c085..246f4647 100644
--- a/src/logic/scripting/LuaState.cpp
+++ b/src/logic/scripting/LuaState.cpp
@@ -94,6 +94,7 @@ void lua::LuaState::createFuncs() {
     openlib("pack", packlib, 0);
     openlib("world", worldlib, 0);
     openlib("player", playerlib, 0);
+    openlib("inventory", inventorylib, 0);
     openlib("item", itemlib, 0);
     openlib("time", timelib, 0);
     openlib("file", filelib, 0);
diff --git a/src/logic/scripting/api_lua.h b/src/logic/scripting/api_lua.h
index 53444a3c..20dece5c 100644
--- a/src/logic/scripting/api_lua.h
+++ b/src/logic/scripting/api_lua.h
@@ -17,7 +17,9 @@
 #include "../../voxels/Chunks.h"
 #include "../../voxels/voxel.h"
 #include "../../items/ItemDef.h"
+#include "../../items/ItemStack.h"
 #include "../../items/Inventory.h"
+#include "../../items/Inventories.h"
 #include "../../lighting/Lighting.h"
 #include "../../logic/BlocksController.h"
 #include "../../window/Window.h"
@@ -229,7 +231,83 @@ static const luaL_Reg playerlib [] = {
     {NULL, NULL}
 };
 
-/* == items-related functions == */
+static void validate_itemid(lua_State* L, itemid_t id) {
+    if (id >= scripting::indices->countItemDefs()) {
+        luaL_error(L, "invalid item id");
+    }
+}
+
+/* == inventory library == */
+static int l_inventory_get(lua_State* L) {
+    lua::luaint invid = lua_tointeger(L, 1);
+    lua::luaint slotid = lua_tointeger(L, 2);
+    auto inv = scripting::level->inventories->get(invid);
+    if (inv == nullptr) {
+        luaL_error(L, "inventory does not exists in runtime: %d", invid);
+    }
+    if (slotid < 0 || uint64_t(slotid) >= inv->size()) {
+        luaL_error(L, "slot index is out of range [0, inventory.size(invid)]");
+    }
+    ItemStack& item = inv->getSlot(slotid);
+    lua_pushinteger(L, item.getItemId());
+    lua_pushinteger(L, item.getCount());
+    return 2;
+}
+
+static int l_inventory_set(lua_State* L) {
+    lua::luaint invid = lua_tointeger(L, 1);
+    lua::luaint slotid = lua_tointeger(L, 2);
+    lua::luaint itemid = lua_tointeger(L, 3);
+    lua::luaint count = lua_tointeger(L, 4);
+    validate_itemid(L, itemid);
+
+    auto inv = scripting::level->inventories->get(invid);
+    if (inv == nullptr) {
+        luaL_error(L, "inventory does not exists in runtime: %d", invid);
+    }
+    if (slotid < 0 || uint64_t(slotid) >= inv->size()) {
+        luaL_error(L, "slot index is out of range [0, inventory.size(invid)]");
+    }
+    ItemStack& item = inv->getSlot(slotid);
+    item.set(ItemStack(itemid, count));
+    return 0;
+}
+
+static int l_inventory_size(lua_State* L) {
+    lua::luaint invid = lua_tointeger(L, 1);
+    auto inv = scripting::level->inventories->get(invid);
+    if (inv == nullptr) {
+        luaL_error(L, "inventory does not exists in runtime: %d", invid);
+    }
+    lua_pushinteger(L, inv->size());
+    return 1;
+}
+
+static int l_inventory_add(lua_State* L) {
+    lua::luaint invid = lua_tointeger(L, 1);
+    lua::luaint itemid = lua_tointeger(L, 2);
+    lua::luaint count = lua_tointeger(L, 3);
+    validate_itemid(L, itemid);
+
+    auto inv = scripting::level->inventories->get(invid);
+    if (inv == nullptr) {
+        luaL_error(L, "inventory does not exists in runtime: %d", invid);
+    }
+    ItemStack item(itemid, count);
+    inv->move(item, scripting::indices);
+    lua_pushinteger(L, item.getCount());
+    return 1;
+}
+
+static const luaL_Reg inventorylib [] = {
+    {"get", l_inventory_get},
+    {"set", l_inventory_set},
+    {"size", l_inventory_size},
+    {"add", l_inventory_add},
+    {NULL, NULL}
+};
+
+/* == item library == */
 static int l_item_name(lua_State* L) {
     auto indices = scripting::content->getIndices();
     lua::luaint id = lua_tointeger(L, 1);
diff --git a/src/logic/scripting/scripting.h b/src/logic/scripting/scripting.h
index bd51a886..717ad88a 100644
--- a/src/logic/scripting/scripting.h
+++ b/src/logic/scripting/scripting.h
@@ -9,7 +9,7 @@ class LuaState;
 
 class Engine;
 class Content;
-class ContentPack;
+struct ContentPack;
 class ContentIndices;
 class Level;
 class Block;
@@ -29,6 +29,7 @@ namespace scripting {
     extern Level* level;
     extern BlocksController* blocks;
 
+    /* Lua environment wrapper for automatic deletion */
     class Environment {
         int env;
     public:
@@ -64,13 +65,28 @@ namespace scripting {
     void on_block_placed(Player* player, const Block* block, int x, int y, int z);
     void on_block_broken(Player* player, const Block* block, int x, int y, int z);
     bool on_block_interact(Player* player, const Block* block, int x, int y, int z);
+
+    /* Called on RMB click on block with the item selected 
+       @return true if prevents default action */
     bool on_item_use_on_block(Player* player, const ItemDef* item, int x, int y, int z);
+    /* Called on LMB click on block with the item selected 
+       @return true if prevents default action */
     bool on_item_break_block(Player* player, const ItemDef* item, int x, int y, int z);
+
+    /* Called on UI view show */
     void on_ui_open(UiDocument* layout, Inventory* inventory);
+    /* Called on UI view close*/
     void on_ui_close(UiDocument* layout, Inventory* inventory);
+
+    /* Load script associated with a Block */
     void load_block_script(int env, std::string prefix, fs::path file, block_funcs_set& funcsset);
+    /* Load script associated with an Item */
     void load_item_script(int env, std::string prefix, fs::path file, item_funcs_set& funcsset);
+    /* Load package-specific world script */
     void load_world_script(int env, std::string prefix, fs::path file);
+    /* Load script associated with an UiDocument */
     void load_layout_script(int env, std::string prefix, fs::path file, uidocscript& script);
+    /* Finalize lua state. Using scripting after will lead to Lua panic */
+
     void close();
 }
diff --git a/src/maths/util.h b/src/maths/util.h
new file mode 100644
index 00000000..15774ae4
--- /dev/null
+++ b/src/maths/util.h
@@ -0,0 +1,49 @@
+#ifndef MATHS_UTIL_H_
+#define MATHS_UTIL_H_
+
+#include <ctime>
+#include <stdint.h>
+
+class PseudoRandom {
+    unsigned short seed;
+public:
+    PseudoRandom(){
+        seed = (unsigned short)time(0);
+    }
+
+    int rand(){
+        seed = (seed + 0x7ed5 + (seed << 6));
+        seed = (seed ^ 0xc23c ^ (seed >> 9));
+        seed = (seed + 0x1656 + (seed << 3));
+        seed = ((seed + 0xa264) ^ (seed << 4));
+        seed = (seed + 0xfd70 - (seed << 3));
+        seed = (seed ^ 0xba49 ^ (seed >> 8));
+
+        return (int)seed;
+    }
+
+    int32_t rand32() {
+        return (rand() << 16) | rand();
+    }
+
+    uint32_t randU32() {
+        return (rand() << 16) | rand();
+    }
+
+    int64_t rand64() {
+        uint64_t x = randU32();
+        uint64_t y = randU32();
+        return (x << 32ULL) | y;
+    }
+
+    void setSeed(int number){
+        seed = ((unsigned short)(number*23729) ^ (unsigned short)(number+16786));
+        rand();
+    }
+    void setSeed(int number1, int number2){
+        seed = (((unsigned short)(number1*23729) | (unsigned short)(number2%16786)) ^ (unsigned short)(number2*number1));
+        rand();
+    }
+};
+
+#endif // MATHS_UTIL_H_
diff --git a/src/objects/Player.cpp b/src/objects/Player.cpp
index 32ad381f..39268de6 100644
--- a/src/objects/Player.cpp
+++ b/src/objects/Player.cpp
@@ -18,10 +18,10 @@ const float FLIGHT_SPEED_MUL = 4.0f;
 const float CHEAT_SPEED_MUL = 5.0f;
 const float JUMP_FORCE = 8.0f;
 
-Player::Player(glm::vec3 position, float speed) :
+Player::Player(glm::vec3 position, float speed, std::shared_ptr<Inventory> inv) :
 		speed(speed),
 		chosenSlot(0),
-		inventory(new Inventory(0, 40)),
+		inventory(inv),
 	    camera(new Camera(position, glm::radians(90.0f))),
 	    spCamera(new Camera(position, glm::radians(90.0f))),
 	    tpCamera(new Camera(position, glm::radians(90.0f))),
@@ -195,7 +195,6 @@ std::unique_ptr<dynamic::Map> Player::serialize() const {
 }
 
 void Player::deserialize(dynamic::Map *src) {
-
 	auto posarr = src->list("position");
 	glm::vec3& position = hitbox->position;
 	position.x = posarr->num(0);
diff --git a/src/objects/Player.h b/src/objects/Player.h
index 390a2147..18f92e55 100644
--- a/src/objects/Player.h
+++ b/src/objects/Player.h
@@ -48,7 +48,7 @@ public:
 
     glm::vec2 cam = {};
 
-    Player(glm::vec3 position, float speed);
+    Player(glm::vec3 position, float speed, std::shared_ptr<Inventory> inv);
     ~Player();
 
     void teleport(glm::vec3 position);
diff --git a/src/voxels/WorldGenerator.cpp b/src/voxels/WorldGenerator.cpp
index a58ca580..c2d8b766 100644
--- a/src/voxels/WorldGenerator.cpp
+++ b/src/voxels/WorldGenerator.cpp
@@ -15,6 +15,7 @@
 
 #include "../content/Content.h"
 #include "../maths/voxmaths.h"
+#include "../maths/util.h"
 #include "../core_defs.h"
 
 // TODO: do something with long conditions + move magic numbers to constants
@@ -62,36 +63,6 @@ public:
     }
 };
 
-class PseudoRandom {
-    unsigned short seed;
-public:
-    PseudoRandom(){
-        seed = (unsigned short)time(0);
-    }
-
-    int rand(){
-        seed = (seed + 0x7ed5 + (seed << 6));
-        seed = (seed ^ 0xc23c ^ (seed >> 9));
-        seed = (seed + 0x1656 + (seed << 3));
-        seed = ((seed + 0xa264) ^ (seed << 4));
-        seed = (seed + 0xfd70 - (seed << 3));
-        seed = (seed ^ 0xba49 ^ (seed >> 8));
-
-        return (int)seed;
-    }
-
-    void setSeed(int number){
-        seed = ((unsigned short)(number*23729) ^ (unsigned short)(number+16786));
-        rand();
-    }
-    void setSeed(int number1,int number2){
-        seed = (((unsigned short)(number1*23729) | (unsigned short)(number2%16786)) ^ (unsigned short)(number2*number1));
-        rand();
-    }
-};
-
-
-
 float calc_height(fnl_state *noise, int cur_x, int cur_z){
     float height = 0;
 
diff --git a/src/world/Level.cpp b/src/world/Level.cpp
index 4bd23183..90d0df46 100644
--- a/src/world/Level.cpp
+++ b/src/world/Level.cpp
@@ -10,6 +10,7 @@
 #include "../physics/PhysicsSolver.h"
 #include "../objects/Player.h"
 #include "../items/Inventory.h"
+#include "../items/Inventories.h"
 
 Level::Level(World* world, const Content* content, Player* player, EngineSettings& settings)
 	  : world(world),
@@ -30,6 +31,8 @@ Level::Level(World* world, const Content* content, Player* player, EngineSetting
 	events->listen(EVT_CHUNK_HIDDEN, [this](lvl_event_type type, Chunk* chunk) {
 		this->chunksStorage->remove(chunk->x, chunk->z);
 	});
+
+	inventories = std::make_unique<Inventories>(*this);
 }
 
 Level::~Level(){
diff --git a/src/world/Level.h b/src/world/Level.h
index 2f42a78b..e670422f 100644
--- a/src/world/Level.h
+++ b/src/world/Level.h
@@ -11,6 +11,7 @@ class World;
 class Player;
 class Chunks;
 class Inventory;
+class Inventories;
 class LevelEvents;
 class Lighting;
 class PhysicsSolver;
@@ -23,6 +24,7 @@ public:
 	Player* player;
 	Chunks* chunks;
 	ChunksStorage* chunksStorage;
+	std::unique_ptr<Inventories> inventories;
 
 	PhysicsSolver* physics;
 	Lighting* lighting;
diff --git a/src/world/World.cpp b/src/world/World.cpp
index d3e934c5..743a36df 100644
--- a/src/world/World.cpp
+++ b/src/world/World.cpp
@@ -13,6 +13,7 @@
 #include "../voxels/ChunksStorage.h"
 #include "../objects/Player.h"
 #include "../window/Camera.h"
+#include "../items/Inventories.h"
 
 world_load_error::world_load_error(std::string message) 
     : std::runtime_error(message) {
@@ -65,6 +66,7 @@ void World::write(Level* level) {
 
 const float DEF_PLAYER_Y = 100.0f;
 const float DEF_PLAYER_SPEED = 4.0f;
+const int DEF_PLAYER_INVENTORY_SIZE = 40;
 
 Level* World::create(std::string name, 
                      fs::path directory, 
@@ -73,8 +75,12 @@ Level* World::create(std::string name,
                      const Content* content,
                      const std::vector<ContentPack>& packs) {
     auto world = new World(name, directory, seed, settings, content, packs);
-    auto player = new Player(glm::vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED);
-    return new Level(world, content, player, settings);
+    auto inv = std::make_shared<Inventory>(world->getNextInventoryId(), DEF_PLAYER_INVENTORY_SIZE);
+    auto player = new Player(
+        glm::vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED, inv
+    );
+    auto level = new Level(world, content, player, settings);
+    level->inventories->store(player->getInventory());
 }
 
 Level* World::load(fs::path directory,
@@ -90,10 +96,13 @@ Level* World::load(fs::path directory,
         throw world_load_error("could not to find world.json");
     }
 
-    auto player = new Player(glm::vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED);
+    auto inv = std::make_shared<Inventory>(0, DEF_PLAYER_INVENTORY_SIZE);
+    auto player = new Player(
+        glm::vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED, inv
+    );
     auto level = new Level(world.get(), content, player, settings);
     wfile->readPlayer(player);
-
+    level->inventories->store(player->getInventory());
     world.release();
     return level;
 }