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)