Polyester bottom backpacks
— a type of synthetic fibre that is widely used in modern equipment, including backpacks for various purposes. At a relatively low cost, polyester looks good, has good strength and reliability, and also provides quite decent protection against water (especially when supplemented with water-repellent impregnation). In addition, this material does not stretch when wet and does not lose strength with prolonged exposure to ultraviolet radiation (unlike nylon). The density and overall quality of polyester in different models can be different, it all depends on the price category.
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