First of all, snipers are basically alone or assisted by observers. The two of them can't take anything more. Since the items you carry are limited, you must focus on carrying them. Take the more important ones and the less important ones. What is the most important thing for a sniper?
Food, of course. Because to go deep into dangerous areas, snipers certainly can't have logistical support like other troops. At this time, it is very important to bring enough food. The amount of food directly determines the sniper's latent time. It also determines whether this mission can be successful.
As for bullets, of course, it is also very important. But what we're talking about here is what snipers carry the most. As long as the number of bullets can kill the target, many snipers only have one bullet, so one bullet is enough for the sniper to complete the task.