What should I bring for a lightweight motorcycle trip across Vietnam? [closed]

In November, myself and two friends will land in Ho Chi Minh, buy motorcycles, drive them to Hanoi over the course of 1.5 months, and sell the motorcycles in Hanoi before flying home. We are all US Citizens.

We are all young males and want to do the trip as efficiently as possible while still enjoying ourselves. We're not above dank hostels, but we aren't looking to camp so won't be bringing tents.

We want to carry as little as possible, because all our belongings will need to either be strapped to our bike or in a pack on our backs. Furthermore, while I don't wish to insult the beautiful country of Vietnam, I understand there is a relatively high possibility of our belongings vanishing due to burglary or outright mugging.

With this in mind, what does the community recommend we bring? Are there any backpacks recommended for this type of journey? So far I've compiled the below general list:

• Motorcycle Helmet (will be on at all times on the bike)

• Backpack large enough to fit all of the below

• Boots / Running shoes (one pair will be on my feet)

• Small chromebook (possibly unnecessary but would be nice to have in hostels, can be tethered for data)

• 3 pairs boxers

• 3 pairs socks

• Jeans/shorts (one pair will be on me)

• Gymshorts (pyjamas, swimwear)

• 3 T-shirts

• Leather jacket(sometimes on me depending on heat)

• Small digital camera

• Moto gloves (sometimes on me depending on heat)

• Galaxy s3, unlocked (for navigation, tethering data when we can)

• Passport

• Prescription contacts and glasses

• 2 credit cards, 50$ USD cash, 100$USD Worth of Vietnamese currency (to have day of landing)

  All of the above are what I plan to bring with me from the States. Things such as hygiene products, bug spray, sun screen and etc I plan to buy there.

Am I totally underestimating the difficulty of this journey? Is this too light weight? Should I considering bringing perhaps a nice shirt for any nightlife we encounter? Am I bringing more than necessary? Any items I should add considering the type of journey and the country? I like to carry a knife for utility (I'm not arrogant or stupid enough to attempt to defend myself with one), is that something I can do in Vietnam? I was told it is possible to withdraw currency from ATMs there, is this true? Is it advisable so that I'm not carrying too much cash in case I get mugged/burgled?