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And here it is

high-density EVA foam padding (backplate)

They need to be warned of its limitations

When in need

MCDS by Sealson Lab | RB36 FASTPACK 2022mum (narrowest to widest section)Fastpacking enthusiasts require gear that can withstand challenging environments and keep up with their pace. To meet these needs, Microdose and Sealson Lab have collaborated to create the RB36 backpack. Design and Features The RB36 is designed by Microdose and engineered by Sealson lab, it features a 27L main compartment, side pockets that can hold 2L each, and a center pocket that can hold 5L, those are made out of Ultra Stretch for easy access and