diff --git a/make_post_sell/models/cart.py b/make_post_sell/models/cart.py
index a751036..7e9c6c7 100644
--- a/make_post_sell/models/cart.py
+++ b/make_post_sell/models/cart.py
@@ -156,6 +156,15 @@ class Cart(RBase, Base):
                 tmp_cart[product_id] += count
             else:
                 tmp_cart[product_id] = count
+
+        self.handling_option = other.handling_option
+        self.handling_cost_in_cents = self.handling_cost_in_cents
+
+        for coupon in other.coupons:
+            if coupon not in self.coupons:
+                self.coupons.append(coupon)
+
+        # this busts memoization.
         self.cart = tmp_cart
 
     @property
diff --git a/make_post_sell/routes.py b/make_post_sell/routes.py
index 26488fc..af32eab 100644
--- a/make_post_sell/routes.py
+++ b/make_post_sell/routes.py
@@ -50,6 +50,7 @@ def includeme(config):
     config.add_route("user_cart_public", "/u/cart/{cart_id}/public")
     config.add_route("user_cart_unpublic", "/u/cart/{cart_id}/unpublic")
 
+
     # cart routes.
     config.add_route("cart", "/cart")
     config.add_route("cart_checkout", "/cart/checkout")
@@ -59,7 +60,7 @@ def includeme(config):
     config.add_route("cart_remove_product", "/cart/{cart_id}/remove")
     config.add_route("cart_quantity_product", "/cart/{cart_id}/quantity")
 
-    config.add_route("cart_handling_option", "/u/cart/{cart_id}/handling-option")
+    config.add_route("cart_handling_option", "/cart/{cart_id}/handling-option")
 
     config.add_route("view_invoice", "/invoices/{invoice_id}")
 
diff --git a/make_post_sell/templates/cart.j2 b/make_post_sell/templates/cart.j2
index a422cd1..3227271 100644
--- a/make_post_sell/templates/cart.j2
+++ b/make_post_sell/templates/cart.j2
@@ -196,7 +196,7 @@
     <h2>Total: ${{ '%0.2f' % cart.total }}</h2>
   {% endif %}
     
-    {% if not cart.is_empty %}
+    {% if not cart.is_empty and request.user == cart.user %}
 
     <a href="/u/cart/{{ cart.id }}/checkout" class="cart-checkout-button mps-button">Checkout</a>
 
@@ -216,9 +216,9 @@
     <a href="/u/cart/save" class="cart-save-button mps-button">Save Cart</a>
     <br/>
     
-    {% elif request.user and request.active_cart != cart %}
+    {% elif request.active_cart != cart %}
     
-      {% if request.user == cart.user %}
+      {% if request.user and request.user == cart.user %}
     <a href="/u/cart/{{ cart.id }}/activate" class="cart-activate-button mps-button">Make Cart Active</a>
     <br/>
       {% else %}
diff --git a/make_post_sell/templates/join-or-log-in.j2 b/make_post_sell/templates/join-or-log-in.j2
index 92aed0f..1c49749 100644
--- a/make_post_sell/templates/join-or-log-in.j2
+++ b/make_post_sell/templates/join-or-log-in.j2
@@ -27,6 +27,11 @@
           required
           autofocus />
 
+      <input
+          name        = "next"
+          type        = "hidden"
+          value       = "{{ next }}" />
+
     <br/>
     <br/>
 
diff --git a/make_post_sell/templates/verification-challenge.j2 b/make_post_sell/templates/verification-challenge.j2
index 39f9700..e8894a5 100644
--- a/make_post_sell/templates/verification-challenge.j2
+++ b/make_post_sell/templates/verification-challenge.j2
@@ -26,6 +26,11 @@
           required
           autofocus />
 
+      <input
+          name        = "next"
+          type        = "hidden"
+          value       = "{{ next }}" />
+
     <br/>
     <br/>
 
diff --git a/make_post_sell/views/__init__.py b/make_post_sell/views/__init__.py
index 712e78d..94c555e 100644
--- a/make_post_sell/views/__init__.py
+++ b/make_post_sell/views/__init__.py
@@ -19,8 +19,11 @@ def user_required(
             if request.user and request.user.authenticated:
                 return fn(request)
             request.session.flash((flash_msg, flash_level))
+            next_url = request.url
             if redirect_to_route_name:
-                return HTTPFound(request.route_url(redirect_to_route_name))
+                return HTTPFound(
+                    request.route_url(redirect_to_route_name, _query={"next": next_url})
+                )
             return HTTPFound(get_referer_or_home(request))
 
         return inner
diff --git a/make_post_sell/views/authentication.py b/make_post_sell/views/authentication.py
index 3a3812f..54f09d0 100644
--- a/make_post_sell/views/authentication.py
+++ b/make_post_sell/views/authentication.py
@@ -82,11 +82,14 @@ def join_or_log_in(request):
 
         request.session.flash(msg)
 
-        email_encoded = urlencode({"email": email})
+        email_encoded = urlencode(
+            {"email": email, "next": request.params.get("next", "")}
+        )
         return HTTPFound("/verification-challenge?{}".format(email_encoded))
 
     return {
         "title": "join or log in",
+        "next": request.params.get("next", request.route_url("home")),
     }
 
 
@@ -127,9 +130,14 @@ def verification_challenge(request):
             # save user and user's active cart.
             request.dbsession.add(user)
             request.dbsession.add(request.active_cart)
-
             request.dbsession.flush()
-            return HTTPFound("/")
+
+            if request.active_cart.count > 0:
+                next_url = "/cart"
+            else:
+                next_url = request.params.get("next", request.route_url("home"))
+
+            return HTTPFound(next_url)
 
         else:
             msg = ("Invalid Verification Code", "error")
@@ -139,4 +147,5 @@ def verification_challenge(request):
         "title": "Please Enter Verification Code",
         "email": email,
         "raw_otp": raw_otp,
+        "next": request.params.get("next", request.route_url("home")),
     }
diff --git a/make_post_sell/views/cart.py b/make_post_sell/views/cart.py
index 921ee38..d5d7dee 100644
--- a/make_post_sell/views/cart.py
+++ b/make_post_sell/views/cart.py
@@ -101,7 +101,6 @@ def cart_unpublic(request):
 
 
 @view_config(route_name="user_cart_activate")
-@user_required()
 def cart_activate(request):
     cart = get_cart_from_matchdict(request)
 
@@ -119,7 +118,7 @@ def cart_activate(request):
         msg = ("This cart is already your active cart.", "success")
 
     else:
-        if request.user.owns_cart(cart):
+        if request.user and request.user.owns_cart(cart):
             msg = ("You activated that cart.", "success")
             request.shop.make_cart_active_for_user(request.user, cart)
         else:
@@ -128,6 +127,7 @@ def cart_activate(request):
             new_cart.merge_in_cart(cart)
             request.dbsession.add(new_cart)
             request.session.flash(msg)
+            request.session["active_cart_id"] = new_cart.uuid_str
             return HTTPFound("/cart/{}".format(new_cart.id))
 
     request.session.flash(msg)