If you have not fried your brain on drugs, you should remember when your parents taught you how to make your bed and put the laundry away. There are always stories about guns and gear being mismatched or people bringing the wrong thing to the range. I for one have been a strong advocate for being range bags that are for individual firearms. I like to leave sight in tools for an AR15 and leave unloaded magpul pmags in the outside of the bag just so I know I have brought the right ones. It can royally suck when you bring a gun to the range and find out you have the wrong magazines or the wrong sight in tool.
When it comes to bringing handguns or other equipment a good range bag is the key to avoiding these types of things. The range bags we seem to be moving the most right now are the Elite Survival bags which come in 3 different sizes. I think most people are probable better off with the medium sized range bags because it’s better to start off with something a little bigger than what you think you might need. Larger bags are for people that really know what they want but be careful you stow your gear consistently and don’t loose your stuff in the bag, it does happen.