diff --git a/ROADMAP.md b/ROADMAP.md
index 1e400fd..782be47 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -1,6 +1,4 @@
 Missing Features:
-- Network Importer need to be able to target Passive Suppliers Chests
-- Passive Supplier Chests need to have configuration to accept from network
 - Storage Access Point
 - Crafting recipes
 
diff --git a/api/mass_storage.lua b/api/mass_storage.lua
index adfb9f0..7005cc8 100644
--- a/api/mass_storage.lua
+++ b/api/mass_storage.lua
@@ -232,6 +232,13 @@ local function allow_mass_storage_inv_take(pos, listname, index, stack, player)
       logistica.update_cache_at_pos(pos, LOG_CACHE_MASS_STORAGE)
       return 0
   end
+  if listname == "upgrade" then
+    if logistica.can_remove_mass_storage_upgrade(pos, stack:get_name()) then
+      return 1
+    else
+      return 0
+    end
+  end
   return stack:get_count()
 end
 
@@ -254,6 +261,12 @@ local function allow_mass_storage_inv_put(pos, listname, index, stack, player)
     logistica.update_cache_at_pos(pos, LOG_CACHE_MASS_STORAGE)
     return 0
   end
+  if listname == "upgrade" then
+    local inv = minetest.get_meta(pos):get_inventory()
+    if not logistica.is_valid_storage_upgrade(stack:get_name()) then return 0 end
+    if inv:get_stack(listname, index):is_empty() then return 1 end
+    return 0
+  end
   return stack:get_count()
 end
 
@@ -278,11 +291,17 @@ local function on_mass_storage_inv_put(pos, listname, index, stack, player)
       end
       inv:set_stack(listname, index, fullstack)
     end
+  elseif listname == "upgrade" then
+    local inv = minetest.get_meta(pos):get_inventory()
+    logistica.on_mass_storage_upgrade_change(pos, inv:get_stack(listname, index):get_name(), true)
   end
 end
 
 local function on_mass_storage_inv_take(pos, listname, index, stack, player)
   if minetest.is_protected(pos, player) then return 0 end
+  if listname == "upgrade" then
+    logistica.on_mass_storage_upgrade_change(pos, stack:get_name(), false)
+  end
 end
 
 local function on_mass_storage_punch(pos, node, puncher, pointed_thing)
@@ -372,4 +391,4 @@ function logistica.register_mass_storage(simpleName, numSlots, numItemsPerSlot,
 
 end
 
-logistica.register_mass_storage("Basic", 8, 512, 2)
+logistica.register_mass_storage("Basic", 8, 1024, 4)
diff --git a/init.lua b/init.lua
index 3f3a6e1..9f73f00 100644
--- a/init.lua
+++ b/init.lua
@@ -7,6 +7,7 @@ logistica.MODPATH = minetest.get_modpath(logistica.MODNAME)
 dofile(logistica.MODPATH.."/util/util.lua")
 dofile(logistica.MODPATH.."/entity/entity.lua")
 dofile(logistica.MODPATH.."/logic/logic.lua")
+dofile(logistica.MODPATH.."/item/item.lua")
 dofile(logistica.MODPATH.."/tools/tools.lua")
 
 -- api should be below the other files except the registrations
diff --git a/item/item.lua b/item/item.lua
new file mode 100644
index 0000000..72242cb
--- /dev/null
+++ b/item/item.lua
@@ -0,0 +1,4 @@
+local path = logistica.MODPATH .. "/item"
+logistica.craftitem = {}
+
+dofile(path .. "/storage_upgrade.lua")
diff --git a/item/storage_upgrade.lua b/item/storage_upgrade.lua
new file mode 100644
index 0000000..0fd6b08
--- /dev/null
+++ b/item/storage_upgrade.lua
@@ -0,0 +1,30 @@
+local S = logistica.TRANSLATOR
+
+logistica.craftitem.storage_upgrade = {}
+
+local items = logistica.craftitem.storage_upgrade
+items["logistica:storage_upgrade_1"] = {
+  description = S("Silverin Storage Upgrade\nAdds 512 Mass Storage Slot Capacity"),
+  storage_upgrade = 512,
+  inventory_image = "logistica_storage_upgrade_1.png",
+  stack_max = 99,
+}
+
+items["logistica:storage_upgrade_2"]= {
+  description = S("Diamond Storage Upgrade\nAdds 1024 Mass Storage Slot Capacity"),
+  storage_upgrade = 1024,
+  inventory_image = "logistica_storage_upgrade_2.png",
+  stack_max = 99,
+}
+
+--------------------------------
+-- registration
+--------------------------------
+
+for name, info in pairs(items) do
+  minetest.register_craftitem(name, {
+    description = info.description,
+    inventory_image = info.inventory_image,
+    stack_max = info.stack_max,
+  })
+end
diff --git a/logic/mass_storage.lua b/logic/mass_storage.lua
index e934e23..fd346d0 100644
--- a/logic/mass_storage.lua
+++ b/logic/mass_storage.lua
@@ -1,12 +1,12 @@
 local META_IMG_PIC = "logimgpick"
 local META_RES_VAL = "logresval"
+local META_UPGRADE_ADD = "logstorupgr"
 local VALID_RESERVE_VALUES = {}
-for i = 0,4096,128 do table.insert(VALID_RESERVE_VALUES, i) end
+for i = 0,5120,128 do VALID_RESERVE_VALUES[i/128 + 1] = i end
 local BASE_TRANSFER_RATE = 10
 
 local function mass_storage_room_for_item(pos, meta, stack)
   local stackName = stack:get_name()
-  local targetStackSize = stack:get_count()
   local maxNum = logistica.get_mass_storage_max_size(pos)
   local filterList = meta:get_inventory():get_list("filter")
   local storageList = meta:get_inventory():get_list("storage")
@@ -32,8 +32,9 @@ function logistica.get_mass_storage_max_size(pos)
   if not node then return 0 end
   local def = minetest.registered_nodes[node.name]
   if def and def.logistica and def.logistica.maxItems then
-    -- TODO: account for upgrades
-    return def.logistica.maxItems
+    local meta = minetest.get_meta(pos)
+    local storageUpgrade = meta:get_int(META_UPGRADE_ADD)
+    return def.logistica.maxItems + storageUpgrade
   end
   return 0
 end
@@ -233,4 +234,30 @@ function logistica.get_mass_storage_imgname_or_first_item(meta)
     if not v:is_empty() then return "\n(Has: "..v:get_description()..")" end
   end
   return "\n(Empty)"
-end
\ No newline at end of file
+end
+
+function logistica.is_valid_storage_upgrade(stackName)
+  return logistica.craftitem.storage_upgrade[stackName] ~= nil
+end
+
+function logistica.on_mass_storage_upgrade_change(pos, upgradeName, wasAdded)
+  local upgradeDef = logistica.craftitem.storage_upgrade[upgradeName]
+  if not upgradeDef or not upgradeDef.storage_upgrade then return true end
+  local meta = minetest.get_meta(pos)
+  local storageUpgrade = meta:get_int(META_UPGRADE_ADD)
+  if wasAdded then storageUpgrade = storageUpgrade + upgradeDef.storage_upgrade
+  else storageUpgrade = storageUpgrade - upgradeDef.storage_upgrade end
+  meta:set_int(META_UPGRADE_ADD, storageUpgrade)
+end
+
+function logistica.can_remove_mass_storage_upgrade(pos, upgradeName)
+  local upgradeDef = logistica.craftitem.storage_upgrade[upgradeName]
+  if not upgradeDef or not upgradeDef.storage_upgrade then return true end
+  local inv = minetest.get_meta(pos):get_inventory()
+  local maxStored = 0
+  for _, st in ipairs(inv:get_list("storage") or {}) do
+    if st:get_count() > maxStored then maxStored = st:get_count() end
+  end
+  local currMax = logistica.get_mass_storage_max_size(pos)
+  return (currMax - upgradeDef.storage_upgrade) >= maxStored
+end
diff --git a/textures/logistica_storage_upgrade_1.png b/textures/logistica_storage_upgrade_1.png
new file mode 100644
index 0000000..956456b
Binary files /dev/null and b/textures/logistica_storage_upgrade_1.png differ
diff --git a/textures/logistica_storage_upgrade_2.png b/textures/logistica_storage_upgrade_2.png
new file mode 100644
index 0000000..890505a
Binary files /dev/null and b/textures/logistica_storage_upgrade_2.png differ