I use silicone cream jars, like these:
https://www.amazon.com/BlueSunshine-Silicone-Cosmetic-Containers-Sealed/dp/B074631R6J/ref=sr_1_9?crid=2AG9LYDBFYLVI&keywords=silicone%2Btravel%2Bjar&qid=1673565971&sprefix=silicone%2Btravel%2Bja%2Caps%2C166&sr=8-9&th=1