Lee, welcome to the world of the little SAK's! Once upon a time, in 1995, I was also very skeptical of the 58mm's, and thought them a joke. A teeny tiny knife fit only for the vest pocket of the CEO to open his mail with. The joke was on me.
The 58mm classic quickly became my most used urban pocket knife, and even today, its one of my most used. They are sooooo handy for modern urban/suburban life that I consider it too important to leave home without one. In fact, in my day to day life, the 58mm is often my regular EDC, and sole EDC pocket knife. It opens all kinds of packages, cuts twine, opens my mail, cuts tape, plucks thorns from between my dog's paws, plucks splinters from my own fingers now and then, deals with lose screws, keeps my nails looking good, trims fishing line, has adjusted the cylinder on the storm door so it closes a bit more gently, replaced the door latch on a Sear's Kenmore clothes drier, and got a conked out motor scooter going again on a dirt road in the middle of nowhere, and too many other things to list.
Its failings are very few; it can't do food duty like cutting a large sandwich in half, slice a loaf of bread, or do wood processing. But if I am in my kitchen, I have kitchen knives. If I go camping, I have a buck sheath knife on my belt. If I have to process wood on a camping trip, I have a saw.
But for the mundane job of going around day to day in my pocket, opening all kinds of packages sealed in plastic, including those plastic blister packages that defy tooth and nail and small amounts of explosive, its a great pocket tool.
I may carry. larger dedicated knife now and then, but mostly I used the classic. The 58mm will handle 98% of what you need, and take up very very little space while riding along with you. The mini tool leaves room for other more important stuff, like cell phone, keyring, wallet, firearm, RONCO pocket defibrillator in case of vapor lock.