Shopping in Hong Kong has become such a hot trend among mainlanders that the government has had to move to limit it to ease the inconvenience caused to Hong Kongers.
Now, residents of neighbouring Shenzhen are limited to one Hong Kong visit a week starting from Monday, compared with an unlimited number of daily trips before.
Mainland shoppers flock to Hong Kong because they consider goods there cheaper and more trust-worthy. So what do mainlanders like to buy in Hong Kong? Let's have a look.
Who are the shoppers?
Many mainland shoppers are individuals who are stocking up on products for their home, or to give or sell at a small profit to friends and neighbours.
But some work in a more organised way for shadowy networks that organise the resale of the goods back in the mainland on a bigger scale - a practice known as parallel trading.
What they like to buy
1. Everyday items
Mainland shoppers are mainly interested in cosmetics, food, alcohol and tobacco, a report by Goldman Sachs shows.
2. Nappies and baby formula
The HK SAR government has a long-standing two tin limit on baby formula leaving Hong Kong, following an outcry over mainland shoppers buying up stocks of baby formula perceived to be safer than Chinese brands.
Many imported medicines available in Hong Kong cannot be purchased on the mainland. They are also sold at cheaper prices.
These are mainly bought by professional traders. Smartphones are sought-after because they can be snapped up in the early days of the latest version's release, when demand outstrips supply, and therefore can be sold at a premium on the mainland.
5. Luxury items such as jewelry and leather goods
Luxury items are more likely to be snapped up by those staying in Hong Kong for longer periods of time.