Luggage and backpacks: cabin size rules, shell materials, and the parts that break first

Luggage is bought on appearance and judged on components. The shell almost never fails first - the wheels, the zip and the telescopic handle do, and those are the parts listings say least about.

Cabin size, before anything else

Indian carriers allow one cabin bag in economy, generally up to 7 kg, plus one personal item such as a handbag or laptop bag. Cabin rules were tightened by the Bureau of Civil Aviation Security and have been enforced firmly since December 2024.

Dimensions differ by airline. Several carriers cap cabin bags at 55 x 35 x 25 cm, while Air India uses 55 x 40 x 20 cm. Those limits include wheels and handles, which is exactly where an over-sized bag gets caught.

Check your specific airline limits before buying, and measure the bag yourself including wheels. Cabin-friendly on a listing is a marketing phrase, not a certification, and gate agents measure the bag rather than the description.

Hard shell or soft

Denier, on soft luggage and backpacks, measures yarn thickness. Higher numbers mean heavier, tougher fabric: 600D is everyday, 1000D and above is genuinely rugged. Ballistic and Cordura nylon are stronger than polyester at the same denier.

The parts that fail

• Wheels. Two-wheel inline systems are more robust on rough Indian pavements; four-wheel spinners are easier in airports. Sealed bearings and larger diameter wheels last longer.
• The telescopic handle. Push it up and down hard in the shop. Wobble, rattle or sticking now means failure within a year.
• Zips. Look for a branded zip, a wide chain and double sliders. A zip that has already parted once will do it again.
• Corner protectors, which decide whether the shell survives baggage belts.
• Stitching on soft bags, especially at strap anchor points - the place a loaded backpack tears.
• Feet and side handles, which take the weight every time a bag is lifted into an overhead bin or a car boot.

Backpacks specifically

• Padded, contoured shoulder straps and a padded back panel decide comfort far more than volume does.
• A sternum strap and, on larger packs, a hip belt transfer weight off the shoulders.
• A separate laptop sleeve, ideally suspended off the base so a dropped bag does not slam the laptop into the ground.
• Water resistance. Most bags are coated rather than waterproof; a rain cover is the practical answer in the monsoon.
• Volume in litres: about 15 to 20 for daily commuting, 25 to 35 for travel, 40 and above for multi-day trips.
• Lockable zip pulls if you travel on crowded trains.

Reading a warranty

Long luggage warranties are common in India and vary in what they exclude. Read for three things: whether airline handling damage is covered, whether wheels and handles are covered as wear items, and whether service is carried out through authorised centres near you.

Keep the invoice and the warranty card, and check that spare parts are actually available - a replaceable wheel set that nobody stocks is not a feature. Register the product if the brand asks; many warranty claims fail on documentation rather than on the defect.

One last piece of practical advice: buy a colour you can spot on a belt from twenty feet, and put an identity tag inside as well as outside. Both cost nothing and solve the two most common travel annoyances there are.