mine's are not working either

Same. I've been trying to figure it out for a few days but no luck. Everything else with the mod seems to work for me no problem.

Upgraded a Big Hiking Pack which now says Tier 1 but I can't attach a water bottle.

Same here

I also am having this issue

Not able to attach anything. Same issue as everyone

same.

i can't attach a water bottle too i have large bag tier 2

Just noticed there is a discussion for this, and figure it's probably a better place to put this than the comments like i originally had. Is anyone else having this issue just using the backpacks+ part of the mod?

It seems the ability to convert things like water bottles into attachable items isn't working with the backpacks+ version. The option is there, but it doesn't convert it, and so can't be added to the water bottle slot. I reloaded with the full version enabled, and it was able to convert the bottle and put it in a backpack slot, so it just seems to be bugged with backpacks+.

I'm not sure if it's the same issue or different. I'm using the full AuthenticZ.

simply a mod conflict. it conflicts with ammo straps carry bullets or whatever it was called.

Removed it and all backpacks work properly now. can fasten bottles to them and everything.

引用自 Count_Zero：

simply a mod conflict. it conflicts with ammo straps carry bullets or whatever it was called.

Removed it and all backpacks work properly now. can fasten bottles to them and everything.

Can you please clarify, for us all?

Which mod did you remove to make this work?

我取消使用AuthenticZ-Lite這個mod後 背包升級就能正常運作

working fine for me on solo but not on a server (same mod list)

I have the same problem