When it comes to Airsoft chest rig, what you need or don’t need depends on personal preference and the specific use or activity. However, here are some common features and considerations:

1. Pouches: Ensure enough pouches for your equipment and ammo. Consider the size, accessibility, and attachment method.
2. Adjustability: Look for chest rigs with adjustable straps for a comfortable fit and secure positioning.
3. Durability: Choose materials that can withstand harsh conditions and heavy use.
4. Compatibility: Ensure the chest rig fits your body armor and plate carrier.
5. MOLLE: If you need to attach additional pouches or gear, look for chest rigs with MOLLE webbing.
6. Quick release: Some chest rigs have a quick-release mechanism for emergencies.
7. Concealment: If you need to keep a low profile, choose a chest rig with a flat, low-profile design.

These are some common factors, but assessing your specific needs and preferences is essential to determine what is necessary for you.

Here is the video by Siege Airsoft on how to sort out your Airsoft chest rig.