How big are biogas storage bags?

Puxin bags set the standards. Here are their measurements, from

http://puxinbiogas.en.alibaba.com/product/263927194-220435925/PUXIN_biogas_storage_bag.html

PUXIN biogas storage bag

 

Used to store the excess biogas every day, with 1 to 200 cubic meter capacity

 

Catalogue of PUXIN biogas Storage Bag

1. Biogas Storage Bag for family Size biogas plant

Type

Specification

Remark

PX-CQD-HY005

0.5M3

PVC, Size:1.5*1.2M Thickness 0.6mm

PX-CQD-HY01

1 M3

PVC, Size:1.5*2.2M Thickness 0.6mm

PX-CQD-HY02

2M3

PVC, Size:1.5*2.8M Thickness 0.6mm

PX-CQD-HY03

3M3

PVC Thickness 0.6mm

PX-CQD-HY05

5M3

PVC Thickness 0.6mm

PX-CQD-HY10

10M3

PVC Thickness 0.6mm

 

2. Biogas Storage Bag for medium and large size biogas plants

Type

Specification

Remark

PX-CQD-RM20

20M3

4*2.5*2.0M

PX-CQD-RM50

50M3

Size: Φ3.3*6M

PX-CQD-RM100

100 M3

Size: Φ4.0*8M

PX-CQD-RM200

200M3

Size: Φ5.0*10M

Materials:Red Mud reinforced plastics

Thickness 1.0mm. The size and shape can be customized.

Question: 

I want to buy or  make my own gas storage bag. I'm aware from your website that I can get them from Puxin or make them out of PVC tarp or .45 mil EPDM pond liner or roofing membrane. How big do I make them to get a known quantity of gas?

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