I bought these to lock the zippers on one pocket to the zippers on another.

Nite Ize PLSBM-01-R3 S-Biner Taglock https://www.amazon.com/dp/B07FQZ7CKT/ref=cm_sw_r_cp_api_i_Z0SNWG6XB9ER5NP4V21C?_encoding=UTF8&psc=1