How's a Ranger to do his job in Metro: Last Light? With all sorts of tools and weapons, of course. Even with other Rangers and his wits, a guy can only do so much in the Metro.
The latest video in the Metro: Last Light Ranger survival guide touches on weapons and inventory. Your best friend is probably your mask, because that, along with a clean air filter, lets you get around outside the tunnels where the air is too toxic for normal lungs. Hey, animals don't exactly mutate in clean air.
Basic suvivability items are important, from the mask to your med kits. Heck, even a lighter comes in handy, and can be used to burn away massive spider webs. Light in general is your friend.
On the more offensive side, Last Light also has a good array of weapons you can choose from and customize. Players can carry up to three on them at a time, so you won't be too limited to what you have on hand. Ammo, on the other hand, is damn rare in this desolate future, used as currency as well as ammunition.
Weapons and Inventory - YouTube