Using a different box than the USPS flat rate boxes?

[hizon_evan]

I am stuck in a rut when it comes to some of the items I plan to sell. These are HO Scale model buildings pre-built, I plan to use those transport boxes from Home Depot around 17x11x11 and up to ship.

Typically, how does eBay calculate shipping if I were to use USPS Priority Mail? Because if I were to use those flat rate boxes then yes, it would be no problem. But I will use a more giant box because it will not fit the buildings.

[kensgiftshop]

@hizon_evan 

To use calculated shipping, you need to enter the box dimensions and what it'll weigh when packed, into the shipping section.

[wooden_flower]

Weigh the item in the box with all of the packing material you will use.  Select calculated shipping, and enter the weight and dimensions, and select ‘priority mail’ (not a flat rate or regional box or envelope). The system will calculate the cost based on weight and distance.

[hizon_evan]

I noticed on the option it says "I don't know the package details" what does that option mean and is that a better choice if I don't plan to use a USPS standard flat rate box? 

[hizon_evan]

I noticed on the option it says "I don't know the package details",  if I don't know the package details or that I decide to use a random box to accommodate to make sure the item fits, is that a good option? 

[kensgiftshop]

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@hizon_evan wrote:

I noticed on the option it says "I don't know the package details" what does that option mean and is that a better choice if I don't plan to use a USPS standard flat rate box? 

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Without the package details, Ebay will not be able to calculate the shipping charge.

If you're not using a Flat Rate box, to get the shipping correct, you need to enter the package details.

If they charge the buyer $10 for shipping and it's going to cost you $35 to ship, you'll have to make up the difference.

[wooden_flower]

No, that is never a good option.  As @kensgiftshop described, if eBay estimates low, as they usually do, you are on the hook for the difference.

If you don't have a box, don't list it yet - get a box and the packaging first, weigh and measure, then list it.