Whenever I walk around I carry a five inch pruning shear tool 5 inches long only has a 1.5 inch cutting edge. Also carry a 6 inch Japanese carpenter knife. Those are real light and my next choice a Japanese Knife Trowel but it weights too much and remains not assessable.
So A long winded question is do you have a light tool that can do spur of the moment work ?
Those tools mentioned could go on a key chain yet enable the hand to do more.
Bill Place in Canada sells both.