Luggage Inspection Defects Manual: The 20 Most Common Luggage Quality Issues

I. Trolley Handles and Carrying Handles (Defects 1–5)

Defect 1: The handle broke under the weight

Load the bag with a 10–15 kg weight and suspend it in the air for 10–15 seconds, observing whether there are any cracks at the base of the handle or whether any rivets or screws are loose. Common causes include the use of recycled plastic in fasteners, insufficient fastening depth, or a stitching density of less than 4 stitches per centimeter. Cracks or noticeable deformation are considered serious defects.

Issue 2: The telescoping rod is jerky or stuck

Pull the telescoping handle back and forth 10–15 times to check whether the resistance is consistent throughout each extension stage; press the button 10 times to check for proper spring return. The main causes are rough tube walls, insufficient spring tension, and deformation of the aluminum tube. If the handle does not extend fully on the first try, this is considered a serious defect.

Defect 3: Peeling or oxidation of the plating on the pull rod

Fully extend the pull handle and inspect the surface from multiple angles under natural light; feel the surface with your hand to check for peeling. Inadequate pre-treatment before electroplating and an insufficiently thick plating layer are the main causes; the area at the base of the pull handle, near the cabinet, is the first to show problems. Peeling of the plating layer exceeding 2 mm² is considered a serious defect.

Issue 4: The pull-rod button is not working

Each time a section is pulled out, verify that it is locked in place (after hearing a ”click,” apply slight downward pressure; it should not retract). Press the button repeatedly 20 times; it should spring back normally each time. The main causes are button spring fatigue and insufficient lubrication of the locking mechanism. Failure to lock in any section or a jammed button is considered a critical defect.

Defect 5: Loose connection between the pull rod base and the cabinet

After pulling out the handle, push and pull the case back and forth to check for wobbling of the base. Open the lining to inspect the number of screws and ensure they are securely tightened. The main causes include fewer than 4 screws, the absence of lock nuts, or insufficient reinforcement plate area in the case body. Wobbling exceeding 3 mm is considered a serious defect.

II. Running Wheels (Defects 6–9)

QB/T 2155-2018 requires that the wear on the wheels not exceed 2 mm after a 12-kilometer running test.

Issue 6: The wheel turns with resistance or makes unusual noises

Place the empty box on a level surface and manually rotate each wheel to see if it can turn freely for at least three revolutions; push the box with a 20 kg load for 5 meters to check for unusual noises or veering off course. The main causes are rusted bearings, improper assembly clearances, and uneven TPU coating. If the wheels do not rotate freely or produce noticeable abnormal noises, this is considered a serious defect.

Defect 7: Wheel frame fracture or wheel detachment

Hold the wheel firmly and shake it vigorously back and forth and side to side to check for deformation of the wheel frame and loose screws; drop the unit once from a height of 50 cm with the corner facing downward to inspect it. The main causes are the use of ABS instead of PA nylon for the wheel frame and an insufficient number of mounting screws. Any cracks are considered a critical defect, and loose screws are considered a serious defect.

Defect 8: Cracks or abnormal wear on the wheel surface

Visually inspect the wheel surface for cracks or bubbles; test the rebound speed by pressing with a fingernail; and inspect the wheel after rolling it 10 meters on a rough surface. The main causes are excessive use of recycled material in the TPU, mismatched hardness, and insufficient injection molding temperature. Visible cracks are considered a serious defect.

Problem 9: The four wheels are not in the same plane (the vehicle pulls to one side when pushed)

Place the empty box on a level surface and press down on each of the four corners to check whether they all make contact with the surface; push the box 5 meters on a level surface, and after releasing it, the box should remain in a straight line. The main causes are deformation of the box mold, foreign objects in the assembly, and dimensional deviations in the four wheels. If the box veers significantly off course and it is confirmed to be a box-related issue, it is classified as a serious defect.

III. Zippers (Defects 10–13)

Defect 10: The zipper sticks when pulled

Open and close the case 10 times to complete the entire process. Pay attention to whether the case gets stuck more easily at the corners, and check whether the two pull tabs slide smoothly past each other when they meet. The main causes include insufficient clearance between the teeth and the pull tabs, burrs on the teeth, and fabric straps sewn in an arched shape. If force is required to pull the case open, this is considered a serious defect.

Defect 11: Zipper teeth skipping or the zipper popping open

After closing the case, push outward from the inside to simulate a fully loaded condition, then use your finger to pry outward from between the teeth to check the engagement strength. The main causes are wear on the slider and the use of a softer material for the chain teeth (zinc alloy instead of copper alloy). Any tooth skipping or spontaneous opening is considered a critical defect.

Defect 12: Tab Detachment

Manually apply a sudden tensile force of 5–10 kg to each pull tab; check whether the connecting ring is fully closed; shake it to listen for any sounds of metal fragments. The main causes are an unclosed connecting ring, a brittle pull tab material, or a connecting ring wire that is too thin. A detached pull tab is considered a serious defect.

Defect 13: Loose stitching or fraying on the zipper tape

Check the entire length of the fabric strip for even stitch spacing and skipped stitches, and apply approximately 10 kg of tension by hand to check for looseness. The main causes include excessive stitch spacing, mismatched tension between the bobbin thread and the top thread, and skipped stitches at the start and end of the seam. Three or more consecutive skipped stitches, or stitches that can be pulled out by hand, are considered serious defects.

IV. Enclosures and Fabrics (Defects 14–16)

Defect 14: Cracks or dents in the hard case

Drop the empty box once on each side from a height of 90 cm (as required by QB/T 2155-2018) and inspect the box for cracks; Press each surface by hand to check for soft spots and unusual noises. The main causes include excessive use of recycled material, low mold temperature leading to internal stress concentration, and uneven wall thickness. Cracks caused by the drop test are classified as critical defects, and dents that do not spring back are classified as serious defects.

Defect 15: Pilling, fraying, or peeling of the soft case fabric’s coating

Run your fingernail back and forth across the fabric surface 5–8 times to check for scratches and coating peeling; observe the fabric under side lighting to check for coating blistering. The main causes include low fabric weight, an incorrect ratio of curing agent in the PU coating, and failure to perform a setting treatment. Coating peeling exceeding 1 cm² is considered a serious defect.

Defect 16: Color variation on the case or a blurry or peeling logo

Place samples from the same batch side by side, compare their colors under a D65 standard light source, and measure the ΔE value using a color difference meter; apply the logo using 3M tape, press it down, and then peel it off quickly. The primary causes are the use of mixed materials from different batches and incompatibility between the screen-printing ink and the box material. A ΔE value greater than 1.5 or a logo that peels off is considered a serious defect.

V. Stitching and Workmanship (Defects 17–18)

Defect 17: Stitch density does not meet standards or skipped stitches

Using a steel ruler, measure the number of stitches over a 5-cm section (≥ 4 stitches per centimeter, i.e., ≥ 20 stitches); open the lining to inspect the internal stitching. The main causes include excessive sewing machine speed, thread that is too fine and prone to breaking, and burrs on the needle plate that snag and break the thread. Areas where the stitch spacing does not meet standards exceeding 10 cm, or where there are more than 3 consecutive skipped stitches, are classified as serious defects.

Defect 18: Delamination of the edging strip or cracking at the seam

Carefully peel back the edging strip section by section, starting from one end, paying particular attention to the corners; once peeled back, inspect the internal seam stitching. The main causes include insufficient or uneven application of hot-melt adhesive, inadequate heat resistance of the adhesive (temperatures inside shipping containers can exceed 70°C), and insufficient holding time. If any section can be peeled off by hand by more than 2 cm, it is considered a serious defect.

VI. Accessories and Hardware (Defects 19–20)

Defect 19: Password Lock Malfunction

Set the password five times, using a new password each time to unlock the lock and confirm it functions properly; after locking, test with an incorrect password to ensure it cannot be opened; check that the TSA keyhole allows the key to be inserted and removed smoothly. The main causes are uneven spring tension in the combination wheel positioning mechanism, burrs in the latch guide slot, and the lack of salt spray testing on the plating. Lock failure is classified as a critical defect.

Defect 20: Rust on hardware or poor plating

Inspect all exposed metal parts under natural light for rust spots and peeling plating; pay special attention to the backs of rivets (where plating is hardest to apply); wipe with a white cloth to check for color transfer. The main causes include the use of iron as the base material, impurities in the plating solution exceeding standards, and failure to conduct salt spray testing before shipment. Visible rust spots or plating peeling are classified as serious defects.

inspection of goodsRapid Screening Protocol

Approximately 6–7 minutes per unit. If even one critical defect (cracking, jammed pull rod, malfunctioning lock) is found, shipment is halted immediately; serious defects are limited to an AQL of 2.5, and minor defects to an AQL of 4.0.

A practical inspection approach. The challenge in inspecting luggage lies in the fact that quality consistency within a single shipment can be very poor—small factories often use a mix of manual and mechanical processes, and differences in worker skill levels are directly reflected in the stitching and assembly. Don’t jump to conclusions based on just 2–3 items. Sample according to the AQL standard, and analyze each incoming batch, mold cavity number, and production line separately to accurately determine the quality distribution.

For luggage exports, the inspection process can be outsourced to a third party.

The luggage inspection process involves many steps, a wide variety of components, and numerous on-site tests.Inspector OnlineWe have been providing third-party inspection services since 2006, with over 2,000 on-site QC inspectors in China. Luggage inspections are conducted by comparing each item against standards such as QB/T 2155-2018, GB/T 30420, and other standards. We have also accumulated data on returns and negative feedback from destination markets—such as which countries have stricter requirements for zippers and which platforms have extremely low tolerance for scratches on luggage—and apply this experience directly during inspections. Please feel free to contact us.