However, most poskim disagree and allow the carrying of a shofar or a lulav for a woman or a child as well as to fulfill a mitzvah d’rabbanan. (Shiurei Bracha, 589:2; Yosef Omets, siman 82; Shulchan Aruch HaRav, 589:2; Orchos Chaim, 589:3; Daas Torah, 589; Kaf HaChaim, 589:28, regarding a woman; Ketzeh HaMateh, 389:5; Igros Moshe, O.C. 3:94, see also Part 2a: Why Brooklyn Is Not a Reshus HaRabbim; Oz Nidberu, 13:38)
The Elef HaMagen (660:1; see also Ketzeh HaMateh, 389:5, and Kuntres Achron) cites the Ostrovtzer rav that the Shagas Aryeh is referring only to a situation of a reshus harabbim d’Oraysa. However, since we do not have a reshus harabbim d’Oraysa today (because we rely on the criterion of shishim ribo) the Shagas Aryeh’s issues do not concern us.