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Shampoo and conditioner together (two in one) - you wash your hair once and get both things at the same time, clean and smooth hair.
A double-sided marker - one marker with two ends you can write and draw with. The marker can have two different colors in one, or two different tip widths, and it saves space in your pencil case.
Singing a song while getting ready in the morning for preschool - you get done what you need to do, and you also enjoy the process.
A rechargeable fan - both a fan and a portable device, it lets us cool off on hot days outside without being plugged into a power source.
A mobile phone - lets us do a huge number of things that used to be separate and done on their own: we can talk, write, play, draw, calculate, take photos, and more.
When we combine several things together, we actually gain efficiency:
instead of carrying lots of things in our school bag, we can now carry just one thing, and it gives us the value of all the other things
for example, in a mobile phone we have lots of things that used to be separate products,
like: a calculator, a phone, a phone book, a game, a screen you can watch things on (instead of a television), a compass, a music app (instead of a radio), and more.
Basically, instead of having every product separately, we have everything together in one place.
Services that people provide can also be combined, instead of offering just one service.
Take, for example, the supermarket where we buy things for our home.
Once it was a relatively small grocery store that only had food items and maybe also cleaning supplies.
Today there are giant supermarkets with all kinds of different products, and they sell stationery, appliances, even cars, all in one place.
Why is that?
Because the supermarkets realized that we spend time there about once a week / every two weeks, and if they give us everything we need / want to buy in one place,
then instead of going to several stores, we'll come specifically to their branch to buy things together with our regular shopping.