As we have seen, even in a place with no eruv, one may carry items needed for food preparation from one domain to another. Once carrying is permitted for okhel nefesh, it is permitted for other reasons as well, as long as it contributes to the enjoyment of Yom Tov. Thus, one may carry a watch in his pocket so that he will know what time it is or sunglasses in his pocket so he will have them if necessary. A woman may go out to the public domain wearing jewelry that she plans to show her friends.
Carrying is also permitted if it will contribute to spiritual enjoyment. One may carry a lulav in order to fulfill the mitzva of shaking it. He may even carry in order to enhance a mitzva. For example, one who already shook his lulav before praying may still carry it to the synagogue in order to shake it during the recitation of Hallel. One may also carry a shofar on Rosh Ha-shana or a lulav on Sukkot to allow women to fulfill these mitzvot (SAH 589:2; SSK ch. 20 n. 5, disagreeing with Sha’agat Aryeh §§106-107).
Those going on an outing with a baby may put the baby in a carriage and take along a bottle, a pacifier, and toys that the child enjoys. They may also take clothing that the baby might need, such as a sweater in case it gets cold out, or a change of clothing in case the baby gets dirty.
An adult may also carry an item of clothing that he might need, such as a sweater. But he may not take clothing that he will not need. One may also take tissues that might be needed.
The poskim disagree about the case where one needs a particular key which is on a key ring with other keys that serve no Yom Tov need. Some maintain that he must detach the needed key, as it is the only one he is permitted to carry. Others say he may carry the entire key ring. Since this disagreement pertains to a rabbinic law, the halakha follows the lenient position.
Let us say one needs to carry a diaper bag or any bag that contains baby paraphernalia as well as muktzeh items. According to the lenient position he may do so, even though he will also be moving the muktzeh, as long as the non-muktzeh items are more important. Since the items were not placed in the bag on Yom Tov, it is considered marbeh be-shi’urim and permitted.