Decide whether to buy an internal-frame pack or an external-frame pack. Internal-frame packs are ideal when you need to store all of your gear inside the pack (to avoid snow or snagging) or when you need the weight of the bag hugging your center of gravity for boulder scrambles, off-trail trekking and rock climbing. External-frame packs are cheaper, simpler in design, have more compartments, are easier to load and unload, can often carry heavier loads, and allow for more circulation between the pack and your back.
Step2
Prepare to spend anywhere from $75 to over $300 for a good external-frame pack.
Step3
Make comfort and weight your primary considerations when selecting a pack. Extra features are fun (and expensive), but in the end you want a pack you can carry with little effort.
Step4
Look for the following features to maximize comfort when carrying a pack: a contoured frame; curved shoulder pads that won't chafe the skin; and an easily adjustable suspension system.
Step5
Choose a bag that's big enough to carry all of your gear, but not so big that it'll be too heavy or have extra room in it.
Step6
Keep in mind the following considerations: if you'll be using it for weekend trips or extended trips; the size of your tent; if you'll be carrying winter clothing or extra gear; if you'll be carrying gear for your hiking partner or a child; and how much weight you're able to carry.
Step7
Consider a waterproof pack with zipper pulls that can be opened with mittens if you plan to be out in the rain or snow.
Step8
Check the bag for durability by looking for solid stitching around the zippers, reinforced bottom panels and reinforced straps.
Step9
Try various backpacks on for fit at a reputable outdoor store with a salesperson willing to spend a bit of time with you. A salesperson will be helpful in suggesting packs and adjusting them for maximum comfort.
Tips & Warnings
Consult Web sites for outdoor magazines and read their product reviews and buying tips before setting out for an outdoor equipment store (see Related Sites).
Consider renting a pack and trying it out before purchasing it. Many outdoor stores offer a range of rentals.
Avoid getting a pack that has too much space for what you'll normally be carrying. Packs fit best when full, and if you have extra room, you're bound to end up carrying the extra loads of your companions.
Don't purchase a pack before trying it on first. If purchasing a pack as a gift, consider bringing the recipient with you or giving him or her a gift certificate to ensure the best fit possible.