All four have a Forever version. The question is how much sorting you want.
| Add-on | One bag | Categories | Bank view | Good for |
|---|---|---|---|---|
 Bagnon |
Yes | Basic | Yes | Simple and fast |
 Baganator |
Yes | Yes | Yes | A modern default |
 BetterBags |
Yes | Yes, automatic | Yes | Sorting by type |
| ArkInventory | Yes | Rules you write | Yes | Full control |
Do you need one at all
The Enhanced preset already turns on one-bag inventory. A bag add-on still helps with search, bank and alts. On the Classic preset, it's one of the first installs.
Older guide: bag add-ons for Forever.