"Blue nets tied between the trees. Found while hiking in the Cinque Terre National Park in Italy"
A: "Pretty sure these are nets for catching the fruit from the tree – currently rolled up because there is no fruit. They were spread out to cover the area beneath the trees when I was there in late summer. I believe it’s for olives."
If I remember correctly that's a book holder, two straps are used to hold the books and that's the handle.
Used on a siphon hose to keep air from entering the vine wile not used, thus preventing vineger growth.
My Dad had some, he'd get them out when we went ice fishing!
Don't Google it, Duckle it!