Travel Backpack Buying Guide: Fit, Organization and Carry-On Practicality

Travel backpacks are usually described by volume in litres. As a general guide, a pack of around 20 to 30 litres suits a day or a short overnight trip, 30 to 40 litres covers many carry-on-only trips of several days, and 40 litres and above suits longer trips or colder climates with bulkier clothing.

How you pack matters as much as trip length. Travellers who use packing cubes and wash clothes along the way can travel for weeks with a carry-on size bag. If you carry camera gear, work equipment or bulky shoes, you will need more space or better organisation.

Carry-on size limits vary between airlines, and budget airlines are often stricter, sometimes allowing only a small under-seat bag without paying extra. Measure the bag including wheels, handles and external pockets when full, because a stuffed front pocket can push a bag over the limit.

Compression straps help keep a partly filled bag compact. Check weight limits too; some airlines limit carry-on weight, and a heavy bag adds up quickly.

A comfortable travel backpack carries weight on your hips as well as your shoulders. For larger bags, look for:

• Padded shoulder straps with a shape that does not rub your neck.
• A sternum strap to stabilise the load.
• A hip belt for heavier loads; ideally removable or stowable when you do not need it.
• Torso length that suits you. Some bags come in sizes or have adjustable harnesses.
• Stowable straps so they do not snag on airport belts or overhead bins.

Clamshell or suitcase-style openings unzip fully so the bag opens like a case. They make packing and finding items much easier. Top-loading bags, common among hiking packs, are simple and weather-resistant but force you to dig for items at the bottom.

Look for a separate, padded laptop compartment you can reach quickly at security, and a small quick-access pocket for passport, phone and boarding pass. Lockable zips and hidden pockets add a layer of security in crowded places.

Durable fabrics with a water-resistant coating help protect contents from light rain. Very few bags are fully waterproof, as zips and seams are weak points, so a rain cover or dry bags help in wet climates. The bag's own weight matters too; a heavy, over-built bag eats into airline weight allowances before you pack anything.

• A padded laptop sleeve that keeps the device off the bottom of the bag.
• A water bottle pocket that fits your bottle.
• Internal compression straps to hold clothes in place.
• A grab handle on the top and side for lifting the bag into overhead bins.
• Luggage pass-through strap if you also travel with a wheeled suitcase.

Be wary of bags with dozens of tiny pockets. Too much built-in organisation can make it harder to use the space flexibly.

• Buying the largest volume "just in case" and then overpacking.
• Ignoring the budget airline's personal item size.
• Choosing a bag without a hip belt for heavy loads.
• Packing a top-loader when you need frequent access to items.
• Measuring the bag empty instead of full.

• Choose volume for trip length and packing style.
• Confirm dimensions and weight against your usual airlines.
• Check strap comfort, torso fit and hip belt.
• Prefer a clamshell opening for frequent packing.
• Look for a quick-access laptop compartment and secure pockets.
• Check fabric, zips and warranty on the seller's page.