Cardstock cracking

[doublecdub]

I'm attempting to make a sturdy box that would work to hold a piece of handmade jewelry and be sturdy enough to be shipped anywhere. I thought to use cardstock however it cracks when I run the bone folders along the edge. Most other paper I've tried has been too thin and the box feels really weak. Any ideas on what to try?

Thanks!!!

[TheRealChris]

elephant hide or watercolour paper could do the job. fold it wet and let it dry.

[HopefulFolds]

Try wet folding the cardstock.