Any Way To Keep A Knife Sheath Supple?

I’ve got some knives made by Marbles, and some knives from Sweden. My dad had a knife of his that he got 40 years ago, that had a leather strap, become very brittle and the snap broke as he was trying to unlatch it. So I was wondering if there was any way to maintain sheath leather, because I can see a lot of my knives getting like that if I don’t do anything.

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