Best place to buy backpacks in Kochi?

I'm moving abroad and need a reliable backpack. I recently purchased a sleek travel bag from Amazon, but it lacked space compared to my trusty Wildcraft office backpack. I've returned the bag and am now searching for alternatives. Can anyone suggest stores with a wide selection of branded backpacks at reasonable prices? I've checked Lulu and other malls, but they mostly have brand outlets with limited options for comparison.