Hi all
I am looking to do a escorted tour of Vietnam.
The tour is 21 days. I have asked what sort of luggage I should bring and all they say is travel light.
Has anyone on this site done this or similar tour. Do I take shower gell, shampoo, day and night clothes etc. 
I haven't been yet but I'm going to Vietnam in August with exodus.co.uk. Even though you're not traveling with them there is a forum there that will have the answers you need. Also there is tripadvisor.co.uk which will likely be of help. For me I'm traveling light mostly because I'm going from north to south and it will be easier with less baggage. Apparently the hotels are good.
As with Almost All Asian Countries, Travel Light as you will be able to Buy just about Any type of clothing and/or toiletries Cheaply there. If you're on the go constantly, you will not want to keep packing and unpacking. It's also hot and humid there, even at night. You may catch a mild day and night, occasionally.