Outdoor Backpacks

Compression straps – These can be used to secure gear to the outside of your pack or to compress and consolidate your load, which helps to improve stability and is particularly useful if your backpack isn't full.

Daisy chains – These loops of webbing can be used to attach items to the pack's exterior with carabiners or cord.

Lid – The lid is used to cover the opening to the interior of your pack and buckles down over the front. In most packs, the lid will contain one or two pockets for storing small essentials. Some packs have a hood that can be removed and used as a small summit pack, which is a handy feature if you're basecamping and plan on making shorter day trips during your stay.

Roll mat/accessory straps – These parts of a backpack can be used to secure sleeping pads to the base of the pack or to attach other gear that is too wet, dirty, or bulky to put inside.

Side pockets – These are ideal for storing water bottles or other items you'd like to access without having to take off your pack. Most are made with mesh or stretch fabric that keeps their contents secure.

Sleeping bag compartment – This compartment at the base of the pack is a handy feature that lets you keep your best sleeping bags separate from the rest of your kit. When not camping, it can also be used to separate dry kit from wet kit, sharps from softs, or clean gear from dirty gear. Some packs have sleeping bag compartments that are separated from the main compartment by a solid sheet of fabric, whereas others use a zippered or toggle-tie divider that provides quick access to the kit at the bottom of the main compartment.

Stash/kangaroo pocket – These large, unzippered pouches are great for temporary storage of larger items you're likely to need on and off throughout a day on the trails, such as your map, gloves, or your rain jacket when hiking in changeable weather.

Walking pole/ice ax loops – Used to attach ice axes or trekking poles to the outside of your pack and, thus, one of the most important parts of a backpack if you plan on doing any winter hiking or mountaineering.

Zippered front-panel access – This increasingly popular feature lets you access your backpack's main compartment without opening the lid or having to unload all of your kit to get to items at the bottom.

Back panel – This refers to the entirety of the back portion of the pack, from the base to the rear of the lid. Most back panels used molded, contoured foam to provide cushioning and create air channels that boost airflow. Come back panels can also be adjusted to find the perfect fit.

Frame – Most modern backpacks use an internal frame that provides the pack with its shape and structure, though some daypacks and ultralight backpacks forego the frame entirely in an effort to cut down on weight. Packs with external frames used to be the go-to for backpackers everywhere, but these days are sliding steadily towards extinction. These packs concentrate the weight of the pack squarely on the hips and allow for a more upright posture while walking but are much bulkier and less stable on rugged trails than their internal-framed cousins.

Haul strap – This loop or handle is used to pick up and move your pack when it's not on your back.

Hip belt – Because the majority of the weight of your load should sit on the hips, choosing a pack with a nicely cushioned and wide hip belt is essential for comfort, especially if you're carrying a heavier pack.

Hip belt pockets – This non-standard feature is very handy for storing small items you like to keep to hand while on the move, such as your GPS device, phone, keys, snacks or gloves.

Hydration port – This is the small opening at the top of the pack, just below the haul strap, that is used to feed the tube from your hydration sack from inside to out.

Load lifters – These are the adjustable straps located between the top of the shoulder straps and the back panel. They are designed to keep the weight of the pack towards your torso, which helps to stabilize the load and keep it centered over your hips, and can make a huge difference to the comfort of your pack when properly adjusted.