The Bags are sold separately. (CHAI002) for one chair and (CHAI008) for 2 chairs in one bag.
Please have a look in the link bellow
Expander Chair Storage Bag (CHAI002) is for a single Expander Chair (CHAI007)
Expander Chair Storage Bag With Carrying Strap (CHAI008) is for a double (2) Expander Chairs (CHAI007)