While months of anti-government protests have taken a toll on Hong Kong businesses, from luxury retailers to hotels and restaurants, Keita Lee's pop-up stall is thriving.

Since demonstrations escalated in mid-June, Lee, 33, has been running what he has dubbed the National Calamity Hardware Store, selling protest essentials — hard hats, gas masks and goggles — near rally hot spots.

Part entrepreneur, part activist, he has taken out short-term leases on storefronts in at least four districts, shifting to evade police and hostile landlords.