Basically the same as Festool/Makita Makpac/Hitachi HSC Systainer etc. This size is wider than the standard 11" x 15 " and therefore ideal for saber saws, SDS drills or other longer power tools. They are actually rated for around 4 times the weight of the package. They are ABS plastic and shouldn't be that bulky. Their biggest advantage is that they are light and compact. Each bag has a top handle so you can comfortably carry a whole stack from the top and they don't take up much space. The disadvantage is that they only have an IP43 protection class. There's no seal on the lid to keep the contents closed, but I've never had a problem with water or dust getting in.
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