diff --git a/source/container/LKMCTag.cpp b/source/container/LKMCTag.cpp
new file mode 100644
index 0000000..68c522c
--- /dev/null
+++ b/source/container/LKMCTag.cpp
@@ -0,0 +1,102 @@
+#include "LKMCTag.h"
+
+ClassImp(LKMCTag)
+
+LKMCTag::LKMCTag()
+{
+    Clear();
+}
+
+LKMCTag::~LKMCTag()
+{
+}
+
+void LKMCTag::Clear(Option_t *option)
+{
+    LKContainer::Clear(option);
+    fIndex.clear(); 
+    fMCID.clear(); 
+    fWeight.clear();
+}
+
+void LKMCTag::Copy(TObject &obj) const
+{
+    ((LKMCTag&)obj).Clear();
+    LKContainer::Copy(obj);
+    for (auto i=0; i<fIndex.size(); i++) 
+        ((LKMCTag&)obj).AddMCWeightTag(fMCID[i], fWeight[i], fIndex[i]);
+    
+}
+
+void LKMCTag::AddMCTag(Int_t mcId, Int_t index)
+{
+    AddMCWeightTag(mcId, 1., index);
+}
+
+void LKMCTag::AddMCWeightTag(Int_t mcId, Double_t weight, Int_t index)
+{
+    bool isExist = false;
+    for (auto i=0; i<fIndex.size(); i++)
+    {
+        if (fIndex[i] == index && fMCID[i] == mcId) {
+            fWeight[i] = fWeight[i] + fabs(weight);
+            isExist = true;
+            break;
+        }
+    }
+
+    if (!isExist) {
+        fIndex.push_back(index);
+        fMCID.push_back(mcId);
+        fWeight.push_back(fabs(weight));
+    }
+}
+
+Int_t LKMCTag::GetMCNum(int index)
+{
+    int num = 0;
+    for (auto i=0; i<fIndex.size(); i++)
+        if (fIndex[i] == index) num++;
+    
+    return num;
+}
+
+Int_t LKMCTag::GetMCID(int mcIdx, int index)
+{
+    if (mcIdx >= GetMCNum(index)) return -999;
+
+    int tmpIdx = 0;
+    for (auto i=0; i<fIndex.size(); i++)
+    {
+        if (fIndex[i] == index) {
+            if (tmpIdx == mcIdx) return fMCID[i];
+            tmpIdx++;
+        }
+    }
+
+    return -999;
+}
+
+Double_t LKMCTag::GetMCPurity(int mcIdx, int index)
+{
+    if (mcIdx >= GetMCNum(index)) return -999.;
+
+    double mcIdxWeight = 0.;
+    double weightSum = 0.;
+    int tmpIdx = 0;
+    for (auto i=0; i<fIndex.size(); i++)
+    {
+        if (fIndex[i] == index) {
+            if (tmpIdx == mcIdx) 
+                mcIdxWeight = fWeight[i];
+            
+            weightSum += fWeight[i];
+            tmpIdx++;
+        }
+    }
+
+    if (weightSum == 0.) return -999.;
+    mcIdxWeight /= weightSum;
+
+    return mcIdxWeight;
+}
\ No newline at end of file
diff --git a/source/container/LKMCTag.h b/source/container/LKMCTag.h
new file mode 100644
index 0000000..e7db7b6
--- /dev/null
+++ b/source/container/LKMCTag.h
@@ -0,0 +1,32 @@
+#ifndef LKMCTAG_HH
+#define LKMCTAG_HH
+
+#include <vector>
+
+#include "LKContainer.h"
+
+class LKMCTag : public LKContainer
+{
+    protected:
+        std::vector<Int_t> fIndex;  // Arbitrary index
+        std::vector<Int_t> fMCID;   // Truth track ID
+        std::vector<Double_t> fWeight; // Truth track weight within same index
+
+    public:
+        LKMCTag();
+        virtual ~LKMCTag();
+
+        virtual void Clear(Option_t *option = "");
+        virtual void Copy (TObject &object) const;
+
+        void AddMCTag(Int_t mcId, Int_t index=-1);
+        void AddMCWeightTag(Int_t mcId, Double_t weight, Int_t index=-1);
+
+        Int_t GetMCNum(int index=-1);
+        Int_t GetMCID(int mcIdx=0, int index=-1);
+        Double_t GetMCPurity(int mcIdx=0, int index=-1);
+
+    ClassDef(LKMCTag, 1)
+};
+
+#endif
\ No newline at end of file