Some items are common sense, some require explanation : 
Brass Ammo / Bags - I buy these mesh bags at Wholesale Sports. They are good because they are light, and stretch to good capacity. Also when you get your brass back it has dirt, sand, and crud and these bags allow that to be shaken out. Very cost effective and very handy. Good for loaded ammo or brass. 

Bag Locks - I've given up on trying to keep keys for locks. My memory is failing, so I've switched to combo style locks. These little Master Locks come in handy for locking gun bags and gun cases. No more keys! 

Shower Cap - No I haven't lost my mind. These little guys can be found at any hotel. What are they good for? Well if you need a good gun cover in a pinch these work wonders and are cheap. Helps keep sand, grime, and dust from getting into your precious firearm. Especially good for those windy days on a sandy range. 

Aspirin - Ya I know what your thinking. No this isn't for handling the night before. A definite must as we all get headaches every now and again. No we can't ask them to keep the noise down on the range. You can make friends very easily by just having this in your bag. 

Proper Gun Storage
Storage of firearms is a delicate subject these days. As serious competitors we should lead by example and properly store our firearms. Ammo should always be stored locked and separate from the firearm unless you have a vault. Do the right thing, store your gun(s) properly. [Picture 1] [Picture 2] [Picture 3] 
Vault Storage - [Picture 1] [Picture 2] [Picture 3]
Transport Case - [Picture 1] [Picture 2] 
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-= Lumpy =-