On saving #2
A tip for the tihik:
Skip sachets. Use a refillable bottle.
(100ml or less if you hand-carry your stuff when traveling by plane.)
Using shampoo/toothpaste sachets may be less bulky and lighter to bring than bottles,
but it would be a waste since we tend to just throw away opened ones (even if all the contents hasn't been used up) after a trip.