I know I'm a bit late to this, but I'm also someone else who relies on comfort items!
I'm in my 20s.
I have many stuffed animals that I feel deep emotional attachment towards, but my main comfort item right now is a mini Tsum Tsum plush of Dory, whom I call "Little Dory." I've had her for over a year now, and I began carrying her everywhere as soon as I got her. Like all my stuffed animals, Little Dory is almost like my child...I have to keep an eye on her (my Instagram has pictures of her poised to get into mischief such as getting ready to jump into an algae-covered pond, drive off on a tractor, climb up a tall tree, fill a Kroger shopping basket full of candy, pestering a sleeping dog, etc), and whenever I see Dory Tsums in Target or Walmart displays, I tend to buy one to stash away as a backup (of which I have about 4 or so)...she's already starting to show a good deal of wear and tear.
I also carry at least one stim toy with me always (Little Dory also functions as a stim toy, but I'm talking about a non-plush stim toy) - right now, that's my clear blue Tangle toy. Then there's my tumbled orange calcite that I have to help with IBS. I've also gotten interested in Steven Universe recently, and one of my favorite characters from the most recent episodes is Rhodonite, an anxious "Off-Color" gem fusion. I read that rhodonite is supposed to help with anxiety, so I ordered a small tumbled rhodonite to carry around as well. It's kind of like having Rhodonite (from the show) close by, and I don't feel so alone.
Then there's my small figurine of Peridot, also from Steven Universe. She's a "Pint Size Heroes" surprise bag figurine who is unique b/c her head was glued on backwards while being manufactured. I didn't notice until a few days after I got her, but it didn't matter much to me - I loved her just the same. The non-plush comfort item I carry in my pockets kind of tends to rotate - before Peridot, I carried a small toy of Clumsy Smurf for a couple months. I also have a die cast of a little blue car named Susie and a Calico Critter cat. A baby Luck Dragon from Safari Ltd. (named Falkor) also lives in my bag.
The amount of comfort items I carry with me definitely fluctuates/increases/decreases depending on the situation - for instance, if I'm in the house (my safe space) I'll probably just have Little Dory, my Tangle, Peridot and my tumbled rocks (I can only imagine what little Peridot think of both of those!) in my pockets, but if I'm to leave the house (where I have less control over what will happen or the situations I will encounter) I'll end up bringing most (if not all) of my main comfort items in my bag.