There’s no need to worry: many children love put-and-take activities and carrying things around with them. It sounds like your son has a great imagination as well as a sense of order and an understanding of object classification. And he has found his own creative way of organizing things in his world and incorporating them into his play. But I do recommend you find a replacement for his interest in the candies, which pose a choking hazard for your son. You may want to look for age-appropriate toys that have been specially designed for put-and-take play and portability—there are lots of toys out there, because children enjoy doing these things so much!
Here are some examples of the type of portable toys you might look for:
Play tools that can be stored and carried in their own toolkit
Pretend make-up that comes with its own cosmetic bag
Small desks that contain crayons, paper, and other arts-and-crafts supplies
Play doctors' kits
Your son’s interests will expand as his experiences do. For example, visiting a farm, zoo or museum might spark his imagination and inspire him to play with, and perhaps collect, toy animals or dinosaurs. Playing with other children will also expand your son’s interests as well as help him to develop his social skills. Eventually, your son will grow out of his current collect-and-carry stage, but his organizational skills will last him a lifetime. In fact, my mother-in-law has told me similar stories about my husband when he was a little boy. He’d keep busy for hours collecting things and separating them into categories, and putting them in neat piles or in small boxes or bags. Now, as an adult, he keeps things organized and everything has its special place. Of course, I’m very happy about that!
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.