Miscellaneous: Leave your favourite and probably expensive umbrella at home. Downpours in Hong Kong can be short but neverthless annoying. If you are caught unawares you can buy an umbrella very cheaply from markets all over Hong Kong. I have also seen them in fashion stores such as H&M. Surprisingly, locally bought umbrellas are decent quality though I dont suspect any umbrella would be much use in a typhoon! Fine for quick downpours though.
an umbrella is a must we travelled in june and it was wet!!!!
a poncho is also good for the kiddies and we noticed that alot of the locals were wearing wet weather boots, which was a great idea considering my daughters shoes sanpped at disneyland because they were so water logged..
Luggage and bags:
Extra Bag for Shopping Loot !
Clothing/Shoes/Weather Gear: Comfortable shoes for trekking up the Big Buddha.
Realised that some sales assistants do serve customers who dress well. So dress well if you are visiting the malls
Camping/Beach/Outdoor Gear: Umbrellas for unpredictable weather !
umbrellas are essential during the monsoon season, which is from July to August.
Toiletries and Medical Supplies: The hospitals in HK are generally efficient and signs are clearly labelled in both Chinese and English, so there's no need to lug your whole family's medicine cabinet over. :)
Photo Equipment: Many areas in HK are very crowded, so keep that in mind when you are packing your photo gear as it might be troublesome trying to jostle with the crowd and handling your SLR at the same time.