It is very hot and humid in July and August so if you're not used to high humidity, I'd suggest bringing very light breathable clothing. CoolMax Alta fabric would be ideal.
Shanghai is also prone to rain showers in July and August so I'd recommend bring a light wind breaker or poncho.
Luggage and bags: The next time I go to Shanghai ( which I will definitely look forward to ) I will pack very few clothes and buy clothes when I get there. Clothing can be had very inexpensively. Here was a store that had pants for 25 Yuan ( $3US) dress jacket 150 Yuan ($18US) and belts and ties for 10Yuan ($1.20US) There are nicer clothing stores and more expensive prices but you can outfit yourself very nicely and have some nice souveniirs as well as easy packing.I bought 3 very comfortable shirts here and 2 nice belts with a very interesting buckle sytem .
Luggage and bags:
Not necessary since you can buy them (unlimited choices!) here.
Clothing/Shoes/Weather Gear: Awesome shopping experience! One of the very best in this world!!! & trust me, I've been to many!
Photo Equipment: Lots of films though one can get them here as well. But, look at the number of photos I took, they are never enough of them!
If you use digital camera, bring as many cards as you can. I use a Sony, so it's memory sticks. They are v. expensive in Shanghai.
Miscellaneous: Lots of RMB or US$. Credit cards are acceptable in most major departmental stores.
This city is a shoppers' paradise :)
Luggage and bags:
Simple. Don't pack anything and splurge in Shanghai. Bags, clothing, toothpaste...all except Western sized shoes and bras can be found here. And it hardly cost a thing. Yepyep, fake indeed, but who cares. Quality is ok and it adds a bit of exotism to your wardrobe (this is the shirt I bought in Shanghai)
Clothing/Shoes/Weather Gear: Bring your own shoes. Anything above a 38 is difficult to find
Toiletries and Medical Supplies: Watson's drugstore (Shanghai Centre on Nanjing Road)sells most Western medication at again, a lot less of what you would pay at home (depending where you come from of course).
Western stomachs seem to be quite compatible with Shanghai food. Immodium might come in handy though. Just in case.
Photo Equipment: Film and having photos developed (Kodak) -same old same old, I know- is very cheap in Shanghai. And fast. Most stores will have your film developed the same day or at the latest, the next day.
Kodak stores can be found all over town.
Voltage is 220 and batteries are not a problem either. Does cheap ring a bell
Camping/Beach/Outdoor Gear: Leave all of that back home. Beaches as we know them cannot be found in Shanghai.
Miscellaneous: An English-Chinese phrasebook comes in handy and so does lots of cash.
More and more department stores accept credit cards, but market shopping is still cash based. USD is still your best bet, although all major currencies can be changed in the Bank of China (some branches are open over the weekend.)
Although the Chinese have become more fashion conscious in the past few years, informal attire is still appropriate for most occasions. The streets are dirty, so you may prefer to bring older clothes and shoes. Sturdy, comfortable walking shoes are a must. Summers are very hot and winters very cold in most of China, so pack accordingly. Avoid bringing clothes that need dry cleaning. You will find it much easier to get around if you travel light, with no more than two or three changes of clothes. Most hotels have reliable overnight laundry and pressing services.
Eyeglasses, film, pantyhose, sundries, and over-the-counter medicines are hard to find in China. Be sure to pack the following essentials: alarm clock, contraceptives, dental floss, deodorant, mosquito repellant, shampoo, shaving cream and razors, sunglasses, sunscreen, tampons, toothbrush, and toothpaste.
If you're planning a longer trip, or will be using local tour guides, bring a few inexpensive items from America as gifts. American cigarettes are popular in China, but if you don't wish to promote smoking, bring candy, T-shirts, or small cosmetic items, such as lipstick and nail polish. Do not give American magazines and books as gifts, as this could be considered propaganda and get your Chinese friends into trouble.
Other useful items to have in China are a flashlight with extra batteries, English-language books and magazines, and a money belt. Bring a pen knife to peel fruit and, if you're going to smaller cities and rural areas, water purification tablets.
To use your U.S.-purchased electric-powered equipment, bring a converter and adapter. The electrical current in China is 220 volts, 50 cycles alternating current (AC); wall outlets take American-style plugs, with two flat parallel prongs; however they may not take the converter's one oversized prong, used for grounding, now in general use in the United States.
If your appliances are dual-voltage, you'll need only an adapter. Don't use 110-volt outlets, marked 'For Shavers Only,' for high-wattage appliances such as blow-dryers. Most laptops operate equally well on 110 and 220 volts and so require only an adapter.
In April, the weather is warm and damp.
Be covered to prevent the allergy because of the polluted air.