Seems like the consensus is for scissors -- and I'd have to say I've found scissors more useful than a knife. (I can spread stuff with a spoon handle if I don't want to have the manners exhibited by some folk ).

However, on one damp and windy hypothermia-promoting day hiking across the Tonto platform in the GC one January, I was grateful to have a pliers on a no-name, fairly junky multitool (only weighs about 3 oz.). My backpack strap broke and I was not able to deal with getting a knot untied with my fingers and then threaded and re-tied to effect a repair. The needle nose pliers worked like a super-tweezer and were the only tool that could have saved the day. I don't think I could have done it even in warm weather and as it was, the wind blowing across my wet hands (couldn't do the work with gloves on) made them impossibly clumsy on their own.