Packing is not a requirement to transition, nor is it required in order to be read as male. In most day-to-day situations, crotch bulges are not obvious, so packing would not make that much of a difference. However, in situations where the crotch is more exposed, packing is a safer option. Some of these situations may include swimming, wearing tight pants (especially when laying on your back) and wearing cycling leggings. In these situations, the lack of a crotch bulge could be quite telling.