I wonder if that person is planning to bug out on foot or by vehicle. 100 pounds in the trunk isn't unreasonable but probably would be for most people if you had to hump it.

Our family bob is super heavy (haven't weighed it) but it supports up to five people, when we add in my personal GHB and my son's survival pack. Our plan is to divvy it up if we have to move on foot, otherwise it's stored in one pack and plan A is to take the jeep if we need to vacate.

As we develop more skill, the weight of our packs is falling. It could well be that this person is new and just doesn't feel confident enough in their skills yet to start shedding weight. Of course, all that ammo might mean they have a different take on survival preparedness than most of us seem to have.