What role does the back band actually play when in use?
It is difficult to determine how to use the back band when carrying the mask, and whether a separate storage pouch is needed.
It is a part that allows you to pack the mask into a small volume when not in use, so you can carry it without a separate pouch[1].
The detail for portability in this mask is the back band[2]. When not in use, you can pack the body into a small volume using this band[3]. The weight is approximately 19g[4]. When choosing items to put in a bag, you can assess the packing method and weight together, dividing and judging the volume it takes up and the added weight.

The specific size after packing has not yet been confirmed.
Product measurements
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Re: Bugproof Mask
Other stated figures
| Part | Value |
|---|---|
| Polyester ◦ | 100cm |
For rows marked with ◦, flat measurement or circumference could not be confirmed in official sources, so hmmm determined them using figures from the same item.