diff --git a/sbnobj/SBND/CRT/CMakeLists.txt b/sbnobj/SBND/CRT/CMakeLists.txt
index 17cc6734..4b8193b8 100644
--- a/sbnobj/SBND/CRT/CMakeLists.txt
+++ b/sbnobj/SBND/CRT/CMakeLists.txt
@@ -7,6 +7,7 @@ cet_make_library(
     CRTStripHit.cxx
     CRTTrack.cxx
     CRTVeto.cxx
+    CRTBlob.cxx
     FEBData.cxx
     FEBTruthInfo.cxx
   LIBRARIES
diff --git a/sbnobj/SBND/CRT/CRTBlob.cxx b/sbnobj/SBND/CRT/CRTBlob.cxx
new file mode 100644
index 00000000..fcb2cde8
--- /dev/null
+++ b/sbnobj/SBND/CRT/CRTBlob.cxx
@@ -0,0 +1,55 @@
+#ifndef SBND_CRTBLOB_CXX
+#define SBND_CRTBLOB_CXX
+
+#include "sbnobj/SBND/CRT/CRTBlob.hh"
+
+namespace sbnd {
+
+  namespace crt {
+
+    CRTBlob::CRTBlob()
+      : fTs0        (0.)
+      , fTs0Err     (0.)
+      , fTs1        (0.)
+      , fTs1Err     (0.)
+      , fPE         (0.)
+      , fTaggerSPs  ({})
+    {}
+
+    CRTBlob::CRTBlob(const double &_ts0, const double &_ets0, const double &_ts1, const double &_ets1,
+                     const double &_pe, const std::map<CRTTagger, int> &_tagger_hits)
+      : fTs0        (_ts0)
+      , fTs0Err     (_ets0)
+      , fTs1        (_ts1)
+      , fTs1Err     (_ets1)
+      , fPE         (_pe)
+      , fTaggerSPs  (_tagger_hits)
+    {}
+
+    CRTBlob::~CRTBlob() {}
+
+    double                   CRTBlob::Ts0() const {return fTs0; }
+    double                   CRTBlob::Ts0Err() const { return fTs0Err; }
+    double                   CRTBlob::Ts1() const {return fTs1; }
+    double                   CRTBlob::Ts1Err() const { return fTs1Err; }
+    double                   CRTBlob::PE() const { return fPE; }
+    std::map<CRTTagger, int> CRTBlob::TaggerSPs() const { return fTaggerSPs; }
+
+    int CRTBlob::TotalSpacePoints() const
+    {
+      int total = 0;
+      
+      for(auto const& [ tagger, count ] : fTaggerSPs)
+        total += count;
+
+      return total;
+    }
+
+    int CRTBlob::SpacePointsInTagger(const CRTTagger tagger) const
+    {
+      return fTaggerSPs.at(tagger);
+    }
+  }
+}
+
+#endif
diff --git a/sbnobj/SBND/CRT/CRTBlob.hh b/sbnobj/SBND/CRT/CRTBlob.hh
new file mode 100644
index 00000000..07bb792c
--- /dev/null
+++ b/sbnobj/SBND/CRT/CRTBlob.hh
@@ -0,0 +1,49 @@
+/**
+ * \class CRTBlob
+ *
+ * \brief Product to store a blob of CRT activity across all walls
+ *
+ * \author Henry Lay (h.lay@sheffield.ac.uk)
+ *
+ */
+
+#ifndef SBND_CRTBLOB_HH
+#define SBND_CRTBLOB_HH
+
+#include "sbnobj/SBND/CRT/CRTEnums.hh"
+
+#include <map>
+
+namespace sbnd::crt {
+
+  class CRTBlob {
+    
+    double                   fTs0;        // average time according to T0 clock [ns]
+    double                   fTs0Err;     // error on average time according to T0 clock [ns]
+    double                   fTs1;        // average time according to T1 clock [ns]
+    double                   fTs1Err;     // error on average time according to T1 clock [ns]
+    double                   fPE;         // total PE
+    std::map<CRTTagger, int> fTaggerSPs;  // how many spacepoints from each tagger contribute to the blob
+
+  public:
+
+    CRTBlob();
+
+    CRTBlob(const double &_ts0, const double &_ets0, const double &_ts1, const double &_ets1, const double &_pe,
+            const std::map<CRTTagger, int> &_tagger_sps);
+
+    virtual ~CRTBlob();
+
+    double                   Ts0() const;
+    double                   Ts0Err() const;
+    double                   Ts1() const;
+    double                   Ts1Err() const;
+    double                   PE() const;
+    std::map<CRTTagger, int> TaggerSPs() const;
+
+    int TotalSpacePoints() const;
+    int SpacePointsInTagger(const CRTTagger tagger) const;
+  };
+}
+
+#endif
diff --git a/sbnobj/SBND/CRT/classes.h b/sbnobj/SBND/CRT/classes.h
index 169c423b..d5a641a0 100644
--- a/sbnobj/SBND/CRT/classes.h
+++ b/sbnobj/SBND/CRT/classes.h
@@ -9,6 +9,7 @@
 #include "sbnobj/SBND/CRT/CRTEnums.hh"
 #include "sbnobj/SBND/CRT/CRTTrack.hh"
 #include "sbnobj/SBND/CRT/CRTVeto.hh"
+#include "sbnobj/SBND/CRT/CRTBlob.hh"
 #include "sbnobj/Common/CRT/CRTHit.hh"
 #include "sbnobj/Common/CRT/CRTHit_Legacy.hh"
 #include "lardataobj/Simulation/AuxDetSimChannel.h"
diff --git a/sbnobj/SBND/CRT/classes_def.xml b/sbnobj/SBND/CRT/classes_def.xml
index 96e69b17..4e0c0791 100644
--- a/sbnobj/SBND/CRT/classes_def.xml
+++ b/sbnobj/SBND/CRT/classes_def.xml
@@ -101,6 +101,7 @@
   <enum name="sbnd::crt::CRTTagger" ClassVersion="10"/>
   <class name="std::set<sbnd::crt::CRTTagger>"/>
   <class name="std::vector<sbnd::crt::CRTTagger>"/>
+  <class name="std::map<sbnd::crt::CRTTagger, int>"/>
   <enum name="sbnd::crt::CoordSet" ClassVersion="10"/>
   <enum name="sbnd::crt::CRTChannelStatus" ClassVersion="10"/>
 
@@ -182,4 +183,20 @@
   <class name="art::Assns<sbnd::crt::CRTSpacePoint, sbnd::crt::CRTVeto,    void>"           />
   <class name="art::Wrapper< art::Assns<sbnd::crt::CRTSpacePoint, sbnd::crt::CRTVeto, void> >"           />
 
+  <!-- CRTBlob -->
+
+  <class name="sbnd::crt::CRTBlob" ClassVersion="10">
+    <version ClassVersion="10" checksum="3696724874"/>
+  </class>
+  <class name="std::vector<sbnd::crt::CRTBlob>"/>
+  <class name="art::Wrapper<sbnd::crt::CRTBlob>"/>
+  <class name="art::Wrapper<std::vector<sbnd::crt::CRTBlob> >"/>
+
+  <!-- associations  -->
+
+  <class name="art::Assns<sbnd::crt::CRTSpacePoint, sbnd::crt::CRTBlob,    void>"           />
+  <class name="art::Wrapper< art::Assns<sbnd::crt::CRTSpacePoint, sbnd::crt::CRTBlob, void> >"           />
+  <class name="art::Assns<sbnd::crt::CRTBlob, sbnd::crt::CRTSpacePoint,    void>"           />
+  <class name="art::Wrapper< art::Assns<sbnd::crt::CRTBlob, sbnd::crt::CRTSpacePoint, void> >"           />
+
 </lcgdict>