There are many:
"Instaheres" Devices which allow PCs to rapidly move from here to there, without needing to spend long periods travelling. If you don't like them being used as "escape hatches", then require set-up time.
Devices which take care of record-keeping and minor necessities, such as Decanters of Endless Water for desert travel, or the Bullskin Tablespread from the story (spread on a table or the ground, three times/day, it would provide food and drink suitable to everyone seated around it). Portable holes loaded with supplies also fall into this category. No need to keep track of arrows and oil used, just fill up the hole every couple of episodes...
A safe, portable place to sleep. Rods of Security, Daern's Instant Fortress, etc.
Items which allow the PCs to "go where no Elf has gone before", whether it's into space, below the waves, into the river of lava (below the surface), etc. Eventually, other planes and probabilities.
"Signature Items" Roland had his sword and horn, Arthur had Excalibur, Argo had his axe. Many PCs will have their signature items. They can provide you with many ideas for "cool stuff".