Is your feature request related to a problem? Please describe.
Trinkets is Fabric-only, Curios API is Forge-only (and has not been updated*), while a new mod called Accessories is cross-compatible with Fabric & NeoForge and has a wide array of features.

Describe the solution you'd like
Add optional support for Accessories so one can wear/view the backpack within your inventory without needing to use the backpack's GUI itself. This would also simplify development and information for users as both the Fabric & NeoForge mod versions could support this mod instead of 2 different ones.

Describe alternatives you've considered
Trinkets and Curios API are limited to a specific mod loader, have slower development, and offer fewer features compared to Accessories.

Additional context
Accessories even has experimental compatibility layers for mods utilizing Trinkets or Curios, but this doesn't seen to be functional with Traveler's Backpack based on my testing.

Compatibility with Accessories (instead of Curios/Trinkets) is going to be default for 1.21+ mod versions. Fabric compat layer will work with backpack I have this fixed in dev environment and I will release an update probably this week

Compatibility with Accessories (instead of Curios/Trinkets) is going to be default for 1.21+ mod versions. Fabric compat layer will work with backpack I have this fixed in dev environment and I will release an update probably this week

Fantastic. I was having issues with the backpack getting unequipped whenever I logged off a local server, and having to re-equip it when I got back on <3

https://www.curseforge.com/minecraft/mc-mods/travelers-backpack/files/5585473
Added optional integration with accessories for neo 1.21

Amazing. I'm closing the issue, but I hope optional integration is planned for the Fabric 1.21 version as well. Thank you for your work.

Fabric update is coming this week stat tuned