The most important factors you need to consider when purchasing a draw-bar box are the tension rod, the caster and the zipper.

The widely-used material for a tension rod is aluminium alloy, with the structure varies from one-section, two-section and three-section. The two-section and three-section ones refer to the draw-bar boxes which can adjust the length according to the weight of box. When purchasing, you can choose in the light of your own preferences or practical conditions. Besides, you need to inspect whether the press button is hommization and whether the tension rod is fluent in use.

The material of caster is usually rubber, wear-resistant, small noise. Casters can be divided into built-in ones and external ones. The external casters that can roll to any directions are called universal wheels. The advantages of universal wheel is that the draw-bar box is free to change directions while its disadvantages is that it cannot bear the tough loading and unloading during shippment. To be safe, built-in ones are safer although they can not change directions freely.

That whether the zipper is smooth when close it is an important standard for consideration. The bigger zipper gives us a safe feeling. The common size of draw-bar boxes is 18 inch, 20 inch, 22 inch, 24 inch, 28 inch, 30 inch and others. Cause draw-bar boxe is imported goods, we use inch as its unit. One inch equals to 2.54 centimeter, 18 inch equals to 45.72 centimeter. In common circumstances, the draw-bar boxes below 20 inch are allowed to board.

When purchasing travelling suitcases, you should inspect the apperance, that whether the corner of box is symmetric, whether the opening is joint close, whether the buckle can be clasped, whether the lining is firm and whether the fabric is broken. Carry handles must be firm enough and are not loosen.

The tension rod need to be capable of expansion and contraction, with some certain intensity. The casters should be flexible, and wheels with bearings are better. When you inspect the lock, you can test several groups of combination. When you choose soft travel box, you must pay attention to the zipper, whether it is smooth, whether there is dislocation,and whether the stitching is straight, make sure there is no empty and jump stitching. Generally, there is a high tendency to have a corner jumper. Secondly, whether there is a disability (such as the fabric of warp weft broken crack, jump wire, horse, etc.), tie rod, go round, locks and other accessories inspection methods and the choose and buy travel suitcase at the same way. The most easily damaged parts are handle, pull rod, and caster.

The carry handles are usually made of plastic. Pay more attention to the plastic quality. Plastic with high quality has plasticity while the bad ones are fragile. Draw-bar boxes are mostly telescoping, press the lock button repeatedly when choosing, should pull rod retractile, fixed link and fitting clearance of telescopic rod should be moderate, can't enlarge either. When choosing the case, the simple method is to put the box upside down, the wheel off the ground, stir the wheel, then put the box on the ground and pull back and forward to make sure there is no disablity.

For any bag, if there is no problem with the below factors, then the bag is exquisite in craft and high quality.

Surface: Even and smooth, , no joint seam, no exposed rough selvadge.

Lining: No matter what you choose to buy, textile or leather, the color should comply with surface. The joint sem of lining should be more, stitching needs to be fine and close.

Strap: It is an important component of bag, and also the most easily damaged part. Inspect whether there is seam and flaw on the strap, whether the bag can hold heavy items. Pay much attention to the straps, and the backpackers attach importance to the burden capacity.

Hardware: As the external decoration, hardwares show more importance. When you choose a bag, the shape and craft of hardware are both important. For example, if the hardware is golden, make it clear that whether its color will fade, and there is no pucker on the seam. To see whether there is seperation at seam or not.

Stitching: No matter the stitching is on the surface or on the lining, the length of stitching needs to be the same without visible threads.

Gel: Drag the components of bag to make sure it’s solid. Especially those fashionable bags, for its good-looking style and excellent decorations, attract people’s eyes. If these decorations aren’t sewed well, they may loose characteristics.

Zipper: To check whether the stitching is tight and the joint seam is natural. Pay more attention to the key holder and makeup holder.

Button: Although it is small accessory when compared to the zipper. For the bags like CD bag, wallets, you should notice the practical applicability.