diff --git a/res/content/base/blocks/coal_ore.json b/res/content/base/blocks/coal_ore.json
index c73998ec..ae2bd25b 100644
--- a/res/content/base/blocks/coal_ore.json
+++ b/res/content/base/blocks/coal_ore.json
@@ -1,4 +1,5 @@
 {
     "texture": "coal_ore",
+    "tags": ["base:ore"],
     "base:durability": 16.0
 }
diff --git a/res/content/base/blocks/water.json b/res/content/base/blocks/water.json
index f7785044..0c2fa020 100644
--- a/res/content/base/blocks/water.json
+++ b/res/content/base/blocks/water.json
@@ -7,5 +7,6 @@
     "obstacle": false,
     "selectable": false,
     "replaceable": true,
-    "translucent": true
+    "translucent": true,
+    "tags": ["base:liquid"]
 }
diff --git a/src/content/ContentBuilder.cpp b/src/content/ContentBuilder.cpp
index ff0bb18a..448adc27 100644
--- a/src/content/ContentBuilder.cpp
+++ b/src/content/ContentBuilder.cpp
@@ -28,6 +28,9 @@ std::unique_ptr<Content> ContentBuilder::build() {
         // Generating runtime info
         def.rt.id = blockDefsIndices.size();
         def.rt.emissive = *reinterpret_cast<uint32_t*>(def.emission);
+        for (const auto& tag : def.tags) {
+            def.rt.tags.push_back(tags.add(tag));
+        }
 
         if (def.variants) {
             for (auto& variant : def.variants->variants) {
diff --git a/src/content/ContentBuilder.hpp b/src/content/ContentBuilder.hpp
index 7d3df1f6..8a938819 100644
--- a/src/content/ContentBuilder.hpp
+++ b/src/content/ContentBuilder.hpp
@@ -62,6 +62,27 @@ public:
     }
 };
 
+struct TagsIndices {
+    int nextIndex = 1;
+    std::unordered_map<std::string, int> map;
+
+    int add(const std::string& tag) {
+        const auto& found = map.find(tag);
+        if (found != map.end()) {
+            return found->second;
+        }
+        return map[tag] = nextIndex++;
+    }
+
+    int indexOf(const std::string& tag) {
+        const auto& found = map.find(tag);
+        if (found == map.end()) {
+            return -1;
+        }
+        return found->second;
+    }
+};
+
 class ContentBuilder {
     UptrsMap<std::string, BlockMaterial> blockMaterials;
     UptrsMap<std::string, rigging::SkeletonConfig> skeletons;
@@ -74,6 +95,7 @@ public:
     ContentUnitBuilder<GeneratorDef> generators {allNames, ContentType::GENERATOR};
     ResourceIndicesSet resourceIndices {};
     dv::value defaults = nullptr;
+    TagsIndices tags {};
 
     ~ContentBuilder();
 
diff --git a/src/content/loading/BlockLoader.cpp b/src/content/loading/BlockLoader.cpp
index bde250a5..a8615e3f 100644
--- a/src/content/loading/BlockLoader.cpp
+++ b/src/content/loading/BlockLoader.cpp
@@ -89,6 +89,7 @@ template<> void ContentUnitLoader<Block>::loadUnit(
 ) {
     auto root = io::read_json(file);
     process_properties(def, name, root);
+    process_tags(def, root);
 
     if (root.has("parent")) {
         const auto& parentName = root["parent"].asString();
diff --git a/src/content/loading/ContentLoadingCommons.hpp b/src/content/loading/ContentLoadingCommons.hpp
index 652b550f..a4a81c98 100644
--- a/src/content/loading/ContentLoadingCommons.hpp
+++ b/src/content/loading/ContentLoadingCommons.hpp
@@ -21,3 +21,17 @@ inline void process_properties(T& def, const std::string& name, const dv::value&
         process_method(def.properties, suffix, field, value);
     }
 }
+
+template <typename T>
+inline void process_tags(T& def, const dv::value& root) {
+    if (!root.has("tags")) {
+        return;
+    }
+    const auto& tags = root["tags"];
+    for (const auto& tagValue : tags) {
+        if (!tagValue.isString()) {
+            continue;
+        }
+        def.tags.push_back(tagValue.asString());
+    }
+}
diff --git a/src/content/loading/ItemLoader.cpp b/src/content/loading/ItemLoader.cpp
index 97ddd334..cba07771 100644
--- a/src/content/loading/ItemLoader.cpp
+++ b/src/content/loading/ItemLoader.cpp
@@ -19,6 +19,7 @@ template<> void ContentUnitLoader<ItemDef>::loadUnit(
 ) {
     auto root = io::read_json(file);
     process_properties(def, name, root);
+    process_tags(def, root);
 
     if (root.has("parent")) {
         const auto& parentName = root["parent"].asString();
diff --git a/src/items/ItemDef.hpp b/src/items/ItemDef.hpp
index 4e7e120c..52ebd835 100644
--- a/src/items/ItemDef.hpp
+++ b/src/items/ItemDef.hpp
@@ -2,6 +2,7 @@
 
 #include <glm/glm.hpp>
 #include <string>
+#include <vector>
 
 #include "data/dv.hpp"
 #include "typedefs.hpp"
@@ -64,11 +65,15 @@ struct ItemDef {
 
     std::string scriptFile;
 
+    std::vector<std::string> tags;
+
     struct {
         itemid_t id;
         blockid_t placingBlock;
         ItemFuncsSet funcsset {};
         bool emissive = false;
+
+        std::vector<int> tags;
     } rt {};
 
     ItemDef(const std::string& name);
diff --git a/src/voxels/Block.hpp b/src/voxels/Block.hpp
index 875d6bf4..3d5a86a9 100644
--- a/src/voxels/Block.hpp
+++ b/src/voxels/Block.hpp
@@ -261,6 +261,8 @@ public:
 
     std::unique_ptr<Variants> variants;
 
+    std::vector<std::string> tags;
+
     /// @brief Runtime indices (content indexing results)
     struct {
         /// @brief block runtime integer id
@@ -285,6 +287,8 @@ public:
         itemid_t pickingItem = 0;
 
         blockid_t surfaceReplacement = 0;
+
+        std::vector<int> tags;
     } rt {};
 
     Block(const std::string& name);