420 denier Pack Cloth Nylon for outer material. The surface of it is slicky and resistant to stain and water.
What is great about it is that the color is vivid.
The inner material has an aluminum sheet to keep the drink warm and also cold.
It has a structure that the fastener can be opened wide so that it is easy to take out the bottle. In addition, it is safe to carry a milk bottle because it has an underlaid cushion.
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