Update

Quick Swap Hand~Bag/Lua/Autorun/init.lua

@@ -0,0 +1,21 @@
+if not CLIENT then return end
+
+Hook.Add("keyUpdate", "quickswap_bag~hand", function()
+    if not PlayerInput.KeyHit(Keys.LeftAlt) then return end
+    if GUI.KeyboardDispatcher.Subscriber then return end
+    local character = Character.Controlled; if character == nil then return end
+    local inventory = character.Inventory; if inventory == nil then return end
+    local bagSlotIndex = inventory.FindLimbSlot(InvSlotType.Bag); if bagSlotIndex < 0 then return end
+    for handItem in character.HeldItems do
+        if inventory.TryPutItem(handItem, bagSlotIndex, true, false, character) then
+            return
+        end
+    end
+    local bagItem = inventory.GetItemAt(bagSlotIndex); if bagItem == nil then return end
+    for _, handSlotType in ipairs { InvSlotType.LeftHand, InvSlotType.RightHand } do
+        local handSlotIndex = inventory.FindLimbSlot(handSlotType)
+        if handSlotIndex >= 0 then
+            if inventory.TryPutItem(bagItem, handSlotIndex, true, false, character) then return end
+        end
+    end
+end)

Quick Swap Hand~Bag/filelist.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<contentpackage name="Quick Swap Hand~Bag" modversion="1.0.0" corepackage="False" gameversion="1.7.7.0" expectedhash="E5BC9CD2964C4C8DEA6F7F40F2E0D278" />