Numbers 13:23

13:23 When they came to the valley of Eshcol, they cut down from there a branch with one cluster of grapes, and they carried it on a staff between two men, as well as some of the pomegranates and the figs.

Numbers 13:14

13:14 from the tribe of Naphtali, Nahbi son of Vopshi;

tn The word is related etymologically to the verb for “slip, slide, bend, totter.” This would fit the use very well. A pole that would not bend would be hard to use to carry things, but a pole or stave that was flexible would serve well.