Snuck into the Game Day Information email: “Do not bring bags larger than an A4 piece of paper. No cloaking facilities available. Don't bring bulky items.”
Anyone who has young kids knows the challenges of trying to carry their stuff in anything smaller than a large overnight hiking bag. The A4 limit has been strictly enforced at Perth Arena a few years, and lots of people have been caught out. Mums in particular have not appreciated this rule. My wife is possibly the kindest and most gentle person I have ever known, and I had to hold her back like the security guard was Phil Read and she was Dale Kickett trying to educate him on the error of his ways.
In the absence of a cloaking room your options once you get to the gate will be limited.
Pack light. Inform your significant other.