Some of the friends I hike with every summer are regular overpackers. They’re stronger than me, so they always have lots of extras and assume everyone else does too. It has caused some momentary awkwardness when someone in the group assumes I have something, and I don’t because that item was duplicated by someone else. We share a list ahead of time of who is bringing what group gear, so there shouldn’t be difficulty, but sometimes there is anyway. For example, one person offered to bring the fuel canisters, and then assumed more people would be carrying them too although that wasn’t in the plan, so we ran a bit short. No biggie, since we could have a campfire. But this kind of thing happens often in our group. I love everything else about hiking with these people, so I don’t try to change it any more. It is what it is.
They also always bring tons of food to share, so I always pack light on food for myself, although I always bring plenty of whatever I agreed to bring for the group. I feel like a skinflint, but it’s not a lack of generosity, it’s simply my inability to comfortably carry more stuff! Not sure what they think but they keep inviting me!