Costco Members Can Bring Guests Along, But There's A Catch - Tasting Table
Briefly

Costco allows members to bring guest while shopping, but only members can make the majority of purchases, protecting the membership value.
Despite the membership requirement, non-members can buy liquor in select states, indicating Costco's flexibility in certain product categories.
Members can bring unlimited children to Costco, provided they supervise them; this policy reflects a family-friendly approach in member privileges.
Shopping hacks exist for non-members, allowing them to save money by coordinating purchases with friends or family who hold a Costco membership.
Read at Tasting Table
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