California Code, Public Resources Code - PRC § 42281.2

(a) On and after January 1, 2025, a store, as defined in Section 42280, shall not provide a precheckout bag to a customer if the bag is not one of the following:

(b) For purposes of this section, a “precheckout bag” means a bag provided to a customer before the customer reaches the point of sale, that is designed to protect a purchased item from damaging or contaminating other purchased items in a checkout bag, or to contain an unwrapped food item, such as, but not limited to, loose produce, meat or fish, nuts, grains, candy, and bakery goods.  “Precheckout bag” does not include a bag used to prepackage items prior to their arrival in a store.