There are lots of reasons why companies and organizations invest in promo products to give out. They're a great way to build visibility for your brand: when you hand out things that can be reused, like a tumbler or towel, your prospective and current clients are reminded of your business on a regular basis. Some branded items are offered in an online store where team members can buy their own merch as they wish; maybe one person prefers a polo while another wants to rep the brand in a baseball t-shirt. Finally, promotional products are frequently used for recognition and awards ceremonies. You're only limited by your own creativity.