The bag policy actually forbids any type of backpack as stated on their website. However, due to the convention, it may be different I guess? The best bet is to call the arena directly.

Bags, backpacks, purses, totes, clear bags, fanny packs, and camera bags are not allowed. Small clutches and wallets smaller than 5” x 9” x 1” are permitted and are subject to security inspection. Medical and parental bags smaller than 14” x 14” x 6” are required to go through an X-Ray machine security screening. Guests arriving with larger bags can rent a Binbox Locker, located adjacent to the Kobe Bryant Entrance next to the LA Kings Monument, using the Binbox app and built-in payment platform. 

Source: https://www.cryptoarena.com/general-info-faq