I use an old video camera bag my dad bought with his video camera 20 years ago. It is divided into compartments. My Glock 17 and Makarov, mags, ammo, and my hearing and eye protection fit nicely in it.
Big, Strong and Durable. Mine has been used regularly for 6+ years, and still going strong. No rips, broken zippers, or failed seams. They were $30 on sale then, but $50 on sale is still a great value. They go on sale often...like right now.
I have been looking at the rolling tool boxes to carry range supplies in. It gets difficult to carry gun cases, sand bags, ear pro, and ammo all at the same time.