Living in Vietnam but will be in LOS next week. I am thinking of send a USB stick to a friend in Italy using the regular mail system (maybe in a regular letter-type envelope, or a small jiffy bag (?) ).
Any ideas how long this would typically take to arrive? A previous postcard from Vietnam to Europe took six months so I'm reluctant to send it from here. TIA for any advice.

What kind of data are you sending? Sensitive Data/ personal data/ Photos?... there are quicker and more secure options...