The best replacement for backer rod is open cell backer rod.

The best alternatives to backer rod are rated as following:
★★★★★  open cell backer rod

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Speaking about backer rod, one probably shouldn't forget about sealant.

Other search terms related to backer rod and their ratings are:
★★★★★ sealant
★★ caulk
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backer rod
open cell backer rod