I am not a fan of multivitamins though I do keep one around and rarely touch it. Most of them contain very low quality components, most notably the vitamin E which is nearly almost always alpha-tocopherol and since I am male that is a major risk for prostate cancer if not taken with the right balance of gamma-tocopherol and selenium. Rather I prefer to take the tocotrienols. Multivitamins also contain a low quality form of vitamin C in the form of ascorbic acid and that is a topic in and of itself. I prefer to get the majority of my vitamin C from green leafy vegetables using a high powered blender that acts as a juicer.
I do at times carry with me a small metal canister that can hold about 10-15 pills when I know I will be eating food someone else made, but most of that is for different formulas of garlic extracts, digestive enzymes, TUDCA, oregano oil and other things that assist with digestion and neutralization of pathogens in food.
If you are interested in these topics a good starting point is nih.gov, just be highly skeptical of any studies you find. Their search is awful so I would use google and put in "site:nih.gov some topic"