The first two numbers are the minimum
diameter in inches. The case is octagonal so there may be directions where
there is slightly more than the minimum diameter.
The second two numbers represent the minimum
length (in inches) of the tripod you'll want to put in the
case.
On the TP-0936 Tuffpak, the overall inside
length of the case is 38 inches. (We made room for the foam that will
protect your tripod.)
In the lid and in the base is
a piece of 2 inch foam which we estimate will be compressed to 1 inch
each. 38 inches less the 2 inches of foam equals the 36 inch measurement
we use.
One other note about the length is that the
top will telescope out approximately 4 inches if needed.
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