I carry my gym bag all the time with me. In it contains: my lifting straps, knee wraps, wrist wraps, elbow wraps, 4 different muscletech products, 3 extra pairs of collars, a pushdown bar, another pair of lifting straps for my intense powerlifting days, 3 different belts (one for powerlifting, one for bodybuilding and another with my name on it), 6-8 protein bars, 2 pairs of gloves, bandana, animalpak t-shirt and sweatshirt and log book.
Have to be prepared!