Following is a list of things that you must or should take along
Passport with all applicable documents (visa, vaccination record, etc.) and extra passport-sized photos
A piece of paper with all the following information: Your passport number ; Family’s contact from your home country ; Your bank’s phone number in case you lose your bank cards ; Your embassy’s address and phone number in Viet Nam ; Emergency number (police, ambulance) ; Your hotel phone and address (if you have booked in advance)
Emergency Kit and Insect Repellent
Camera and batteries or charger
Medicines if you have existing prescriptions
Your travel guide book
Sunglasses and Sunscreen: 45 SPF should be enough for the severity of heat and sunray in Viet Nam.
Underwear: bring lots
Swimsuits: if you are planning for the beach
Footwear: if you plan to walk a lot, bring a pair of walking shoes. Flip-flops are also popular options. However, sandals are recommended if you want to visit pagodas, museums and mausoleums.
Below is a list of what you might or might not want to take depending on your need
Mobile phone, laptop, music player and respective chargers
Sanitary paper or tampons, if you are really loyal to your brand