Possible Fixes

Yes

Modpack Version

0.2.53

What happened?

Entered a pyramid, dispensers contained a variety of loot including a Traveler's backpack. When the dispenser was triggered to drop the backpack the game crashed. The dispenser and backpack could otherwise be interacted with normally and the backpack dropped from inventory normally. It appears to occur with all types of traveler's backpack as well as when playing singleplayer.

Crash Log

https://gist.github.com/NavajoCody/938a0cceb7bc5902a5fe58f4c71ddc18

Latest.Log

https://gist.github.com/NavajoCody/b8e259585e2f8709f859052f4c1cbed2

Have you tried updating Traveler's Backpack to the last compatible version, then reproducing?

I updated Traveler's Backpack while running the 0.2.53 version of the modpack, and had the same crash under the same conditions. I also updated to the 0.2.54 version of the modpack, which I see has the updated version of Traveler's Backpack and checked it, finding the same crash.

I've attached the Latest.log
https://gist.github.com/NavajoCody/d33bc6263a97ef9b4e98072797d98580
And the crash report.
https://gist.github.com/NavajoCody/318bf3258679a151412eac7cbc1f4e18

Have you tried getting an RFTools Builder to place a Traveler's Backpack?

The Traveler's Backpack can be moved using the RFTools Builder without crashing