diff --git a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
index f8516d6932d..aac18100263 100644
--- a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
+++ b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
@@ -217,6 +217,7 @@ class POSInvoice(SalesInvoice):
 		self.validate_loyalty_transaction()
 		self.validate_company_with_pos_company()
 		self.validate_full_payment()
+		self.update_packing_list()
 		if self.coupon_code:
 			from erpnext.accounts.doctype.pricing_rule.utils import validate_coupon_code
 
@@ -410,9 +411,9 @@ class POSInvoice(SalesInvoice):
 					)
 				elif is_stock_item and flt(available_stock) < flt(d.stock_qty):
 					frappe.throw(
-						_(
-							"Row #{}: Stock quantity not enough for Item Code: {} under warehouse {}. Available quantity {}."
-						).format(d.idx, item_code, warehouse, available_stock),
+						_("Row #{}: Stock quantity not enough for Item Code: {} under warehouse {}.").format(
+							d.idx, item_code, warehouse
+						),
 						title=_("Item Unavailable"),
 					)
 
@@ -867,10 +868,8 @@ def get_bundle_availability(bundle_item_code, warehouse):
 	bundle_bin_qty = 1000000
 	for item in product_bundle.items:
 		item_bin_qty = get_bin_qty(item.item_code, warehouse)
-		item_pos_reserved_qty = get_pos_reserved_qty(item.item_code, warehouse)
-		available_qty = item_bin_qty - item_pos_reserved_qty
 
-		max_available_bundles = available_qty / item.qty
+		max_available_bundles = item_bin_qty / item.qty
 		if bundle_bin_qty > max_available_bundles and frappe.get_value(
 			"Item", item.item_code, "is_stock_item"
 		):
@@ -893,13 +892,49 @@ def get_bin_qty(item_code, warehouse):
 
 
 def get_pos_reserved_qty(item_code, warehouse):
+	"""
+	Calculate total quantity reserved for the given item and warehouse.
+
+	Includes:
+	- Direct sales of the item in submitted POS Invoices
+	- Sales of the item as a component of a Product Bundle
+
+	Excludes consolidated invoices (already merged into Sales Invoices via
+	POS Closing Entry). Used to reflect near real-time availability in the
+	POS UI and to prevent overselling while multiple sessions may be active.
+	"""
+	pinv_item_reserved_qty = get_pos_reserved_qty_from_table("POS Invoice Item", item_code, warehouse)
+	packed_item_reserved_qty = get_pos_reserved_qty_from_table("Packed Item", item_code, warehouse)
+
+	reserved_qty = pinv_item_reserved_qty + packed_item_reserved_qty
+
+	return reserved_qty
+
+
+def get_pos_reserved_qty_from_table(child_table, item_code, warehouse):
+	"""
+	Get the total reserved quantity for a given item in POS Invoices
+	from a specific child table.
+
+	Args:
+	  child_table (str): Name of the child table to query
+	                (e.g., "POS Invoice Item", "Packed Item").
+	  item_code (str): The Item Code to filter by.
+	  warehouse (str): The Warehouse to filter by.
+
+	Returns:
+	  float: The total reserved quantity for the item in the given
+	                warehouse from submitted, unconsolidated POS Invoices.
+	"""
 	p_inv = frappe.qb.DocType("POS Invoice")
-	p_item = frappe.qb.DocType("POS Invoice Item")
+	p_item = frappe.qb.DocType(child_table)
+
+	qty_column = "qty" if child_table == "Packed Item" else "stock_qty"
 
 	reserved_qty = (
 		frappe.qb.from_(p_inv)
 		.from_(p_item)
-		.select(Sum(p_item.stock_qty).as_("stock_qty"))
+		.select(Sum(p_item[qty_column]).as_("stock_qty"))
 		.where(
 			(p_inv.name == p_item.parent)
 			& (IfNull(p_inv.consolidated_invoice, "") == "")