Was in Costco Moorabbin and saw a banner for a free cooler bag (with bottle opener) and carry bag or large tumbler when you auto renew your existing membership online. You need to set up a Costco online account. Set to renew on the account. Show to CS in store and choose your freebie.
Worked out perfectly as I just picked up a box of Magnums and large pack of Krispy crinkle cut potato chips.
Looks like it's nationwide. Some stores may only offer 1 or the other depending stock