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How good hiking backpack brands determines pack volume?

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How REI Determines Pack Volume  REI’s test team uses a standardized test method, known as the ASTM F2153, to calculate the volume of our REI-brand backpacks. The tester fills the packs–including all the pockets–with gumball-sized plastic balls. The balls are then poured out into a measuring cylinder calibrated to measure liters.  Extended capacity? Many packs are designed with features to increase the carrying capacity beyond the normal capacity. This is also measured at REI, and listed as Extended Capacity.
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Endian sport backpack brands is one of the large physical factory,with 18 years experience to export to Europe & America,also require the recognition of well-known international brand.With a professional team in sales, research & development and several production bases, we're confident of developing satisfactory samples for you as per your reference samples, artworks or other relevant demands. In the meanwhile, the company also customized automatic production lines according to the various requirements of the different products, which helps us keep our prominent advantage in the bags manufacturing area. We ensure not only that our products have competitive prices, but also that our production can be completed on time.

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