Yes, a good, purpose-built pack is good. But for short hikes in areas where you do not need to bring extra gear, carrying your skis over your shoulder is not that big a deal. Carry them tips-forward, with the toe-piece behind your shoulder, and one hand loosely holding the tips wherever they balance best. Carry both poles in the other hand, and resist the temptation to use those poles for regular support, like a walking cane. You'll save energy, balance better, and usually move more efficiently if you just hold the poles in the middle and let your arm swing naturally, most of the time. Plant the poles only as needed to recover balance and to assist in more difficult sections.
For longer hikes still without the need for a pack and extra gear, try the trick they know at Aspen Highlands as a "Bowl Strap" (used for hiking the famed Highland Bowl). It is a simple loop of nylon webbing, 8-10' long, that can be wrapped in a couple of clever ways to hold your skis on your back, with loops that go over your shoulders like backpack straps. Some people like to use a carabiner or ski strap to clip the straps together across the sternum, preventing them from slipping off your shoulders. It's a great option--lightweight, cheap, and pocket-sized--that frees both hands for the hike.
If you happen to find yourself at Aspen Highlands, looking to hike The Bowl (a strenuous 30-60 minute hike along an exposed ridge), stop in at the Patrol Headquarters at the beginning of the hike and support the patrol by buying one of their pre-made Bowl straps ($8, last time I checked). Let them show you how to rig it, and get the inside scoop on snow conditions and such as well.