How to measure your skybox
The container shall be large enough to permit the animal to stand in a natural position, turn around and lie down (see the proportional dimensions specified in the illustration). For transportation of more than one animal in the same container, the dimensions should relate to the largest animal. For transportation of 2 animals in the same container, the width of the container should be calculated as 3 x C, for 3 animals in the same container the calculation is 4 x C. The guide lines mentioned above are from the IATA Live Animal Regulations book.
Why PAN uses as well the sitting position
Most of all dogs when owner wants to measure will lower the head. Thus giving a false height size. A sitting position is a natural height.
Bag Size: In-cabin Series #000
Bag Weight: 2kg / 3lbs
Exterior : 43x28x24cm / 17x11x11in
Interior : 41x26x22cm / 16x10x10in
Crate Size: Small Series #100
Crate Weight: 3kg / 6lbs
Exterior : 53x41x38cm / 21x16x15in
Interior : 45x31x33cm / 18x12x13in
Crate Size: Medium Series #200
Crate Weight: 5kg / 11lbs
Exterior : 71x50x55cm / 28x21x21in
Interior : 59x41x48cm / 23x16x20in
Crate Size: Intermediate Series #300
Crate Weight: 7kg / 15lbs
Exterior : 82x58x64cm / 32x23x25in
Interior : 71x41x61cm / 29x20x24in
Crate Size: Large Series #400
Crate Weight: 9kg / 19lbs
Exterior : 90x64x71cm / 36x25x28in
Interior : 81x56x66cm / 32x22x26in
Crate Size: Extra Large Series #500
Crate Weight: 13kg / 27lbs
Exterior : 102x64x76cm / 40x25x30in
Interior : 92x61x71cm / 36x24x28in
Crate Size: Giant Series #700
Crate Weight: 22kg / 52lbs
Exterior : 122x81x89cm / 48x32x35in
Interior : 108x77x83cm / 43x30x33in