diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1a0fa1180c..b37decedcb 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -27,7 +27,7 @@ Since last release
 * Adds support for Cython3 (#1636)
 * Adds TotalInvTracker, which allows an inventory cap to be set for multiple resource buffers, and is now required for material buy policy (#1646)
 * AddMutalReqs and AddReciepe functions and exclusive bids in python API of DRE (#1584)
-* Created Package class and optional declaration of packages in input files (#1673)
+* Created Package class and optional declaration of packages in input files (#1673), package id is a member of resources (materials/products) (#1675)
 
 **Changed:**
 
diff --git a/src/context.cc b/src/context.cc
index 1bcb0bc4f3..cea27a6e0b 100644
--- a/src/context.cc
+++ b/src/context.cc
@@ -203,13 +203,23 @@ void Context::AddPackage(std::string name, double fill_min, double fill_max,
     ->Record();
 }
 
-Package::Ptr Context::GetPackage(std::string name) {
+Package::Ptr Context::GetPackageByName(std::string name) {
   if (packages_.count(name) == 0) {
     throw KeyError("Invalid package name " + name);
   }
   return packages_[name];
 }
 
+Package::Ptr Context::GetPackageById(int id) {
+  // iterate through the list of packages to get the one package with the correct id
+  std::map<std::string, Package::Ptr>::iterator it;
+  for (it = packages_.begin(); it != packages_.end(); ++it) {
+    if (it->second->id() == id) {
+      return it->second;
+    }
+  }
+}
+
 void Context::InitSim(SimInfo si) {
   NewDatum("Info")
       ->AddVal("Handle", si.handle)
diff --git a/src/context.h b/src/context.h
index 5bbad65dea..0b45786dc9 100644
--- a/src/context.h
+++ b/src/context.h
@@ -256,7 +256,9 @@ class Context {
                   std::string strategy = "first");
 
   // Retrieve a registered package. 
-  Package::Ptr GetPackage(std::string name);
+  Package::Ptr GetPackageByName(std::string name);
+
+  Package::Ptr GetPackageById(int id);
 
   int random();
 
diff --git a/src/material.cc b/src/material.cc
index 6f3d8c8097..1823835b3d 100644
--- a/src/material.cc
+++ b/src/material.cc
@@ -15,15 +15,15 @@ const ResourceType Material::kType = "Material";
 Material::~Material() {}
 
 Material::Ptr Material::Create(Agent* creator, double quantity,
-                               Composition::Ptr c) {
-  Material::Ptr m(new Material(creator->context(), quantity, c));
+                               Composition::Ptr c, int package_id) {
+  Material::Ptr m(new Material(creator->context(), quantity, c, package_id));
   m->tracker_.Create(creator);
   return m;
 }
 
 Material::Ptr Material::CreateUntracked(double quantity,
                                         Composition::Ptr c) {
-  Material::Ptr m(new Material(NULL, quantity, c));
+  Material::Ptr m(new Material(NULL, quantity, c, default_package_id_));
   return m;
 }
 
@@ -48,6 +48,7 @@ void Material::Record(Context* ctx) const {
   ctx_->NewDatum("MaterialInfo")
       ->AddVal("ResourceId", state_id())
       ->AddVal("PrevDecayTime", prev_decay_time_)
+      ->AddVal("PackageId", package_id_)
       ->Record();
 
   comp_->Record(ctx);
@@ -87,8 +88,7 @@ Material::Ptr Material::ExtractComp(double qty, Composition::Ptr c,
   }
 
   qty_ -= qty;
-
-  Material::Ptr other(new Material(ctx_, qty, c));
+  Material::Ptr other(new Material(ctx_, qty, c, default_package_id_));
 
   // Decay called on the extracted material should have the same dt as for
   // this material regardless of composition.
@@ -141,6 +141,30 @@ void Material::Transmute(Composition::Ptr c) {
   }
 }
 
+void Material::ChangePackageId(int new_package_id) {
+  if (ctx_ != NULL) {
+    throw ValueError("Package Id cannot be changed with NULL context");
+  }
+  if (new_package_id == package_id_) {
+    // no change needed
+    return;
+  }
+  else if (new_package_id == default_package_id_) {
+    // default has functionally no restrictions
+    package_id_ = new_package_id;
+    return;
+  }
+ 
+  Package::Ptr p = ctx_->GetPackageById(package_id_);
+  double min = p->fill_min();
+  double max = p->fill_max();
+  if (qty_ >= min && qty_ <= max) {
+    package_id_ = new_package_id;
+  } else {
+    throw ValueError("Material quantity is outside of package fill limits.");
+  }
+}
+
 void Material::Decay(int curr_time) {
   if (ctx_ != NULL && ctx_->sim_info().decay == "never") {
     return;
@@ -218,12 +242,13 @@ Composition::Ptr Material::comp() {
   return comp_;
 }
 
-Material::Material(Context* ctx, double quantity, Composition::Ptr c)
+Material::Material(Context* ctx, double quantity, Composition::Ptr c, int package_id)
     : qty_(quantity),
       comp_(c),
       tracker_(ctx, this),
       ctx_(ctx),
-      prev_decay_time_(0) {
+      prev_decay_time_(0),
+      package_id_(package_id) {
   if (ctx != NULL) {
     prev_decay_time_ = ctx->time();
   } else {
@@ -236,4 +261,8 @@ Material::Ptr NewBlankMaterial(double quantity) {
   return Material::CreateUntracked(quantity, comp);
 }
 
+int Material::package_id() {
+  return package_id_;
+}
+
 }  // namespace cyclus
diff --git a/src/material.h b/src/material.h
index 958cac7498..4a1de69af3 100644
--- a/src/material.h
+++ b/src/material.h
@@ -81,7 +81,7 @@ class Material: public Resource {
   /// pointer to the agent creating the resource (usually will be the caller's
   /// "this" pointer). All future output data recorded will be done using the
   /// creator's context.
-  static Ptr Create(Agent* creator, double quantity, Composition::Ptr c);
+  static Ptr Create(Agent* creator, double quantity, Composition::Ptr c, int package_id = default_package_id_);
 
   /// Creates a new material resource that does not actually exist as part of
   /// the simulation and is untracked.
@@ -153,8 +153,14 @@ class Material: public Resource {
   /// DEPRECATED - use non-const comp() function.
   Composition::Ptr comp() const;
 
+  int package_id();
+
+  /// Changes the package id. Checks that the resource fits the package 
+  /// type minimum and maximum mass criteria.
+  void ChangePackageId(int new_package_id = default_package_id_);
+
  protected:
-  Material(Context* ctx, double quantity, Composition::Ptr c);
+  Material(Context* ctx, double quantity, Composition::Ptr c, int package_id = default_package_id_);
 
  private:
   Context* ctx_;
@@ -162,6 +168,7 @@ class Material: public Resource {
   Composition::Ptr comp_;
   int prev_decay_time_;
   ResTracker tracker_;
+  int package_id_;
 };
 
 /// Creates and returns a new material with the specified quantity and a
diff --git a/src/package.cc b/src/package.cc
index 8dc79eda42..5e2e394b47 100644
--- a/src/package.cc
+++ b/src/package.cc
@@ -20,12 +20,8 @@ Package::Ptr Package::Create(std::string name, double fill_min, double fill_max,
   Ptr p(new Package(name, fill_min, fill_max, strategy));
   return p;
 }
-
-int Package::id() {
-  return id_;
-}
   
-Package::Package() : id_(next_id_++), fill_min_(0), fill_max_(std::numeric_limits<double>::max()), strategy_("first") {}
+Package::Package() : id_(next_id_++), fill_min_(0), fill_max_(std::numeric_limits<double>::max()) {}
 
 Package::Package(std::string name, double fill_min, double fill_max, std::string strategy) : name_(name), id_(next_id_++), fill_min_(fill_min), fill_max_(fill_max), strategy_(strategy) {}
 
diff --git a/src/package.h b/src/package.h
index 4244c23576..20e6a53862 100644
--- a/src/package.h
+++ b/src/package.h
@@ -19,7 +19,16 @@ class Package {
     // create a new package type
     static Ptr Create(std::string name, double fill_min, double fill_max, std::string strategy);
 
-    int id();
+    // returns package id
+    int id() const { return id_; }
+    // returns package name
+    std::string name() const { return name_; }
+    // returns package fill min
+    double fill_min() const { return fill_min_; }
+    // returns package fill max
+    double fill_max() const { return fill_max_; }
+    // returns package strategy
+    std::string strategy() const { return strategy_; }
 
   protected:
     Package();
diff --git a/src/product.cc b/src/product.cc
index 3ab8da1ae9..39fc25fa47 100644
--- a/src/product.cc
+++ b/src/product.cc
@@ -12,17 +12,18 @@ int Product::next_qualid_ = 1;
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Product::Ptr Product::Create(Agent* creator, double quantity,
-                             std::string quality) {
+                             std::string quality, int package_id) {
   if (qualids_.count(quality) == 0) {
     qualids_[quality] = next_qualid_++;
     creator->context()->NewDatum("Products")
         ->AddVal("QualId", qualids_[quality])
         ->AddVal("Quality", quality)
+        ->AddVal("PackageId", package_id)
         ->Record();
   }
 
   // the next lines must come after qual id setting
-  Product::Ptr r(new Product(creator->context(), quantity, quality));
+  Product::Ptr r(new Product(creator->context(), quantity, quality, package_id));
   r->tracker_.Create(creator);
   return r;
 }
@@ -62,7 +63,7 @@ Product::Ptr Product::Extract(double quantity) {
 
   quantity_ -= quantity;
 
-  Product::Ptr other(new Product(ctx_, quantity, quality_));
+  Product::Ptr other(new Product(ctx_, quantity, quality_, package_id_));
   tracker_.Extract(&other->tracker_);
   return other;
 }
@@ -72,11 +73,40 @@ Resource::Ptr Product::ExtractRes(double qty) {
   return boost::static_pointer_cast<Resource>(Extract(qty));
 }
 
+int Product::package_id() {
+  return package_id_;
+}
+
+void Product::ChangePackageId(int new_package_id) {
+  if (ctx_ != NULL) {
+    throw ValueError("Package Id cannot be changed with NULL context");
+  }
+  if (new_package_id == package_id_) {
+    // no change needed
+    return;
+  }
+  else if (new_package_id == default_package_id_) {
+    // default has functionally no restrictions
+    package_id_ = new_package_id;
+    return;
+  }
+  
+  Package::Ptr p = ctx_->GetPackageById(package_id_);
+  double min = p->fill_min();
+  double max = p->fill_max();
+  if (quantity_ >= min && quantity_ <= max) {
+    package_id_ = new_package_id;
+  } else {
+    throw ValueError("Material quantity is outside of package fill limits.");
+  }
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Product::Product(Context* ctx, double quantity, std::string quality)
+Product::Product(Context* ctx, double quantity, std::string quality, int package_id)
     : quality_(quality),
       quantity_(quantity),
       tracker_(ctx, this),
-      ctx_(ctx) {}
+      ctx_(ctx),
+      package_id_(package_id) {}
 
 }  // namespace cyclus
diff --git a/src/product.h b/src/product.h
index 6f0e9ee8c7..0c41dff89d 100644
--- a/src/product.h
+++ b/src/product.h
@@ -28,7 +28,7 @@ class Product : public Resource {
   /// pointer to the agent creating the resource (usually will be the caller's
   /// "this" pointer). All future output data recorded will be done using the
   /// creator's context.
-  static Ptr Create(Agent* creator, double quantity, std::string quality);
+  static Ptr Create(Agent* creator, double quantity, std::string quality, int package_id = default_package_id_);
 
   /// Creates a new product that does not actually exist as part of
   /// the simulation and is untracked.
@@ -71,11 +71,17 @@ class Product : public Resource {
   /// @throws ValueError 'other' resource is of different quality
   void Absorb(Product::Ptr other);
 
+  // Returns the package id.
+  int package_id();
+
+  /// Changes the product's package id
+  void ChangePackageId(int new_package_id);
+
  private:
   /// @param ctx the simulation context
   /// @param quantity is a double indicating the quantity
   /// @param quality the resource quality
-  Product(Context* ctx, double quantity, std::string quality);
+  Product(Context* ctx, double quantity, std::string quality, int package_id = default_package_id_);
 
   // map<quality, quality_id>
   static std::map<std::string, int> qualids_;
@@ -85,6 +91,7 @@ class Product : public Resource {
   std::string quality_;
   double quantity_;
   ResTracker tracker_;
+  int package_id_;
 };
 
 }  // namespace cyclus
diff --git a/src/resource.h b/src/resource.h
index b13b52431e..04ff568250 100644
--- a/src/resource.h
+++ b/src/resource.h
@@ -79,6 +79,8 @@ class Resource {
   /// @return a new resource object with same state id and quantity == quantity
   virtual Ptr ExtractRes(double quantity) = 0;
 
+ protected:
+  const static int default_package_id_ = 1;
  private:
   static int nextstate_id_;
   static int nextobj_id_;