diff --git a/init.lua b/init.lua
index 90f916b..fb15b6c 100644
--- a/init.lua
+++ b/init.lua
@@ -9,8 +9,6 @@ end
 i3 = {
 	modules = {},
 	MAX_FAVS = 6,
-	INV_SIZE = 4*9,
-	HOTBAR_LEN = 9,
 	ITEM_BTN_SIZE = 1.1,
 	DROP_BAG_ON_DIE = true,
 	MIN_FORMSPEC_VERSION = 4,
@@ -75,9 +73,13 @@ i3 = {
 	},
 
 	progressive_mode = core.settings:get_bool"i3_progressive_mode",
+	legacy_inventory = core.settings:get_bool"i3_legacy_inventory",
 	item_compression = core.settings:get_bool("i3_item_compression", true),
 }
 
+i3.HOTBAR_LEN = i3.legacy_inventory and 8 or 9
+i3.INV_SIZE   = 4 * i3.HOTBAR_LEN
+
 i3.files.common()
 i3.files.api(http)
 i3.files.compress()
diff --git a/settingtypes.txt b/settingtypes.txt
index 42bc83e..fa5e80d 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -2,4 +2,7 @@
 i3_progressive_mode    (Learn crafting recipes progressively)    bool false
 
 # Regroup the items of the same type in the item list.
-i3_item_compression    (Regroup items of the same type)    bool true
+i3_item_compression    (Regroup items of the same type)          bool true
+
+# Set the inventory size to common chests size (8*4).
+i3_legacy_inventory    (Legacy inventory size)                   bool false
\ No newline at end of file
diff --git a/src/common.lua b/src/common.lua
index 43e5262..d053fb3 100644
--- a/src/common.lua
+++ b/src/common.lua
@@ -539,7 +539,7 @@ local function sort_inventory(player, data)
 	local inv = player:get_inventory()
 	local list = inv:get_list"main"
 	local size = inv:get_size"main"
-	local start_i = data.ignore_hotbar and 10 or 1
+	local start_i = data.ignore_hotbar and (i3.HOTBAR_LEN + 1) or 1
 
 	if true_table(data.drop_items) then
 		list = drop_items(player, inv, list, start_i, data.drop_items)
diff --git a/src/gui.lua b/src/gui.lua
index 7f7a819..891df50 100644
--- a/src/gui.lua
+++ b/src/gui.lua
@@ -122,7 +122,9 @@ local function get_stack_max(inv, data, is_recipe, rcp)
 end
 
 local function get_inv_slots(fs)
-	local inv_x, inv_y, size, spacing = 0.22, 6.9, 1, 0.1
+	local inv_x = i3.legacy_inventory and 0.75 or 0.22
+	local inv_y = 6.9
+	local size, spacing = 1, 0.1
 
 	fs"style_type[box;colors=#77777710,#77777710,#777,#777]"
 
diff --git a/src/hud.lua b/src/hud.lua
index 90f191f..5469460 100644
--- a/src/hud.lua
+++ b/src/hud.lua
@@ -34,10 +34,12 @@ local function init_hud(player)
 		},
 	}
 
-	core.after(0, function()
-		player:hud_set_hotbar_itemcount(i3.HOTBAR_LEN)
-		player:hud_set_hotbar_image"i3_hotbar.png"
-	end)
+	if not i3.legacy_inventory then
+		core.after(0, function()
+			player:hud_set_hotbar_itemcount(i3.HOTBAR_LEN)
+			player:hud_set_hotbar_image"i3_hotbar.png"
+		end)
+	end
 end
 
 local function show_hud(player, data)