During the 1930s, Kirkpatrick left Owen Gardener & Sons to work for main competitor, Brisbane bottler 'Tristram's', selling 'Kirk's Ginger Beer' under their brand.

For this, Tristram's were taken to court by then Owen Gardner & Sons' owner Robert Sweeney, asserting their exclusive right to the Kirk's name.

[3] During the nineteen-eighties, the Kirks, Shelleys (NSW) and Gest (WA) brands shared a range of drinks with consistent packaging style and marketing material.

[4][5] In 2000, now under Coca-Cola Amatil, the brands Kirks, Shelleys and Gest, along with Halls (SA), and Marchants, were unified, all taking the name of the Queensland bottler nationwide.

[8] Fruita and Sno Drop were originally products of Halls, whereas Kole Beer was produced by Gest.

Kirks Originals: Creaming Soda, Lemonade, Big Sars, Old Stoney Ginger Beer, Lemon Squash, Pasito, Portello, Ginger Ale (QLD Only), Kolé Beer (WA Only), Sno Drop (SA Only), Fruita (VIC, SA & TAS Only) Kirks Surprises Limited Edition: Strawberries and Cream, Watermelonade (watermelon Chupa Chup), Lime Spider, Enchanted Fruits (raspberry, blackberry and strawberry Chupa Chup),[10] Sticky Toffee Apple, Tropical Bluetopia (pineapple and berry),[11] Summer Sorbet (mango and peach),[12] Fizzy Flamingo (peach and raspberry),[13] Sunny Stardust (pineapple and strawberry).