Amazon warehouse requirements vary from country to country. The following is extracted from Amazon seller's Guide

US Canada Amazon

Length standard:

The box used to pack a variety of standard size goods shall not exceed 25inch on any side, i.e. 63.5cm

There is no clear limit on the size of the box containing a single SKU, but it only indicates that the maximum box size of UPS can be used (UPS official website: length + perimeter < = 165in (419cm), length < = 108in (270cm))

Overweight standard:

The weight of a single box cannot exceed the standard weight limit of 50LB, unless the weight of each commodity in it exceeds 50LB.

For a single overweight product exceeding 50LB, an obvious "team lift" label shall be affixed on the top and around the outer box

For a single overweight product exceeding 100lb, an obvious "mech lift" label shall be affixed on the top and around the outer box

The single box of jewelry and watches shall not exceed 40lb

Tray size: 40 "X 48" X72 "/ 1.2x1x1.8m, 1500Lb

European Amazon

Length standard:

The box used to pack a variety of standard size goods shall not exceed 63.5cm on each side

There is no clear limit on the size of the box containing a single SKU, but it only indicates that the maximum box size of UPS can be used (UPS official website: length + perimeter < = 165in (419cm), length < = 108in (270cm))

Overweight standard:

The box should not exceed the standard weight of 15kg, unless the weight of each commodity in it exceeds 15kg, and the maximum weight limit is 30kg.

For goods weighing more than 15kg, the weight should be clearly written on the box, and "team lift" or "heavy package" should also be clearly marked on the top and four sides of the box.

The weight of the box used to hold jewelry or watches shall not exceed 15 kg.

Tray size: UK: 1.2x1x1 8m, 1000kg EU (except the UK): 1.2x0 8x1. 8m 500kg

Amazon Japan

Length standard:

Standard size not exceeding 50cm x 60cm x 50cm

Large size: length + width + height < 170cm

Special large size: 170cm < length + width + height < 200cm, and one side shall not exceed 90cm

Overweight standard:

If a single box is more than 15kg, the label of "weight exceeding" shall be affixed on the top and around the outer box

The maximum weight limit is less than 40kg

Tray size: no need to support