When sizing a bag to fit a round container the following formula is quite helpful.

1. Calculate the circumference (C) of the container. C = Diameter (D) x 3.14

2. The width of the bag would be the circumference (C) divided by 2; plus 1 inch.
Width of Bag (W) = ( Circumference (C) / 2 ) + 1

3. The length (L) of the bag = container height + container diameter (D) + 5 inches for an overhang or to close.

So in this example for a container size 18 inches in diameter x 30 inches high:

Step 1
Circumference = 18 x 3.14
= 56.52

Step 2
Bag Width = (56.52 / 2) + 1 inch
= 29.26 inches
Let's say 29.25 inches.

Step 3
The length of the bag = 30 inches + 18 inches + 5 inches
= 53 inches

Therefor a container size of diameter 18 inches x height 30 inches would require a bag size of 29.25 x 53 inches long in order to line the cylinder (container) and close the bag at the top.

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