Pack it yourself and save some money, or let an international moving company handle it and save yourself the trouble. Plenty of people compare only the price and never think through the consequences. They open the boxes in the destination country, find things broken, the shipment stuck in customs, or the insurance claim denied, and only then wish they had worked out the difference between the two options beforehand.

Here are the 4 differences that matter most.

1. Difference one: insurance. Pack it yourself and breakage isn't covered

Not many people know this rule: for items you packed yourself, marine insurance pays out for loss only, not for damage.

You fill a carton with dishes, porcelain and ornaments, ship it overseas, open it at the other end and find half of it shattered. The insurer won't pay. The reasoning is simple: there's no way to tell whether your packing was at fault or whether the damage happened in transit. To be specific: fragile items in cardboard boxes cannot be claimed for transit damage, whether or not you bought insurance.

If you have fragile or valuable items at home, this point alone usually settles the question of who does the packing.

2. Difference two: packaging compliance. Destination customs may not accept your packing

Many people think packing just means stuffing things into a box and sealing it. But international sea freight is not a domestic courier shipment. Destination customs has hard requirements for packaging; fail them and you're looking at a fine at best, seizure of the goods at worst.

Japan is the classic example:

• No writing or markings on the outside of the box: Japanese customs requires clean outer packaging
• Original packaging with a manufacturer's logo can't be used; plain wood crates and packaging carrying a manufacturer's logo cannot be exported and may trigger additional duties
• Wooden crates must be fumigation-free plywood or three-ply board, reinforced with five-layer corrugated cardboard
• No instruction manuals, labels or price stickers on the packaging
• Japan-bound LCL shipments also require a uniform shipping mark on the outer carton, or the goods cannot enter the supervised warehouse

Miss these when packing yourself and your goods either get repacked in Japan or shipped back.

Japan isn't alone. Plenty of countries have similar hidden compliance requirements: crates containing solid wood can't be used as is; the original packaging of certain branded appliances may carry a logo that triggers an infringement inspection (some brands have IP filings with customs) … it's hard to catch all of these on your own.

International moving companies run these routes year-round and know each country's rules inside out, so they pack to the destination country's standard. Pack it yourself and that information gap can cost you thousands.

3. Difference three: packaging materials. The bubble wrap you can buy locally won't survive the ocean

A domestic courier shipment gets jostled for a few days. Sea freight drifts in a container for 1 to 3 months through heat, humidity, movement and stacking pressure. Boxes at the bottom of a container bear loads far beyond what you'd imagine.

The materials you can buy yourself are a long way from what an international moving company uses:

A professional mover's material system goes well beyond cartons: cotton paper soft-wrap cushioning for porcelain and glass; EPE foam as the middle layer and cardboard as the outer layer for furniture and appliances, sealed in moisture barrier bags to keep water vapour out; corner protectors for edges; fumigation-free export pallets for easy handling.

One easily overlooked detail: packing typically adds about 20% to the net volume of the goods. Bulging cartons, a one or two centimetre error in measuring, or a fragile item wrapped in several extra layers can all show up on the bill.

An example: a set of porcelain you packed yourself sits under other boxes in the container for two months and arrives half shattered, with no insurance payout. The same items packed by a professional international moving team, with bubble wrap + cotton paper + five-layer corrugated heavy carton + wooden crate, have a far lower chance of damage; and if something does go wrong, there are photos, a packing list and a claim assessment process to fall back on.

4. Difference four: customs clearance. New furniture can easily be classed as commercial goods

Sea freight for a move is declared as "personal effects" for customs clearance, which is the basis for duty-free entry in most countries. The UK's Transfer of Residence Relief and Japan's residence card duty-free channel, for instance, both rest on a declaration of "used items for personal use".

But if you pack newly bought furniture yourself and handle it the wrong way, a customs inspection can easily classify it as commercial goods, meaning back taxes at best or seized goods at worst.

When an international moving company packs, it handles the items and packaging in line with destination clearance requirements, so they are declared as used personal effects.

Don't underestimate this. Inspection rates are high at US, Canadian, Japanese and Australian customs. Take the practical rhythm of a customs inspection: the inspection notice is issued 3 to 7 days after the goods arrive at port, the queue takes about 3 to 7 working days (up to 10 to 15 working days in peak season), and after the container is opened and verified, any supplementary documents mean another round of review. Once goods are judged to be non-personal-use, duty-free eligibility is revoked and the combined tax rate can land between 15% and 40%, depending on the destination country and category. If poor packing triggers an inspection, you lose not just money but time.

5. Quick decision table

Put simply: a few boxes of old clothes and books are fine to pack yourself. But if there is anything fragile, any new or large furniture, or a strict destination country, hand it to a professional international moving company.

6. Choosing an international moving company: a look at Seapoe Relo

If you've decided by now to let a moving company handle the packing, take a look at Seapoe Relo (Seapoe).

The key advantages of having a moving company pack: professional materials, insurance that covers damage, packaging compliance, clearance compliance. Seapoe has clear operating standards for each. Founded in 2015 and headquartered in Shanghai, the company's service network covers nearly a hundred countries and regions, it handles more than 8,000 orders a year, and has over 100 staff each in its office and logistics teams. Its clients include employees of leading internet and overseas-expansion companies, embassy and consulate staff, and corporate executives.

On packing, Seapoe equips its teams to international moving standards with drop-resistant, moisture-proof materials: they bring a full set of materials to your home and handle items by type (soft wrapping for pianos and porcelain, EPE foam plus corner protectors for furniture). Once items reach the warehouse, the warehouse team reinforces them a second time; fragile and valuable items can go into fumigation-free wooden crates and onto pallets, and goods are checked against item numbers multiple times along the way. The domestic warehouse offers 30 days of free storage, useful for clients who need to receive goods in batches.

Customs experience is worth mentioning too. Seapoe has established operations in Japan, the EU, the US and Australia, where packaging compliance is strict. For Japan, it checks the residence card and the unaccompanied baggage declaration form item by item at the receiving stage; for the EU, the EORI number and VAT number. And unlike many consolidation companies, Seapoe runs its own operation: origin warehouses in Shanghai, Guangzhou and Beijing with a total area over 10,000 square metres, not a middleman that subcontracts to a third party after collecting your goods. Clearance is strictly handled as personal effects, and complex item names can still be declared. It also provides door-to-door service at both ends: pickup and packing at origin, delivery and carry-in at destination.

Prices and rates above are for reference only; actual charges are subject to real-time confirmation. Sea freight fluctuates with fuel, capacity, geopolitical conditions and other factors, so quotes are time-sensitive. Confirm your sailing date early.