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Packing cubes are mostly an organization tool. Compression cubes genuinely shrink clothes — and that is how bags end up over the weight limit rather than the size limit.
The classic U-shaped pillow puts most padding behind the neck. Upright sleepers’ heads drop forward and sideways — which is exactly where the pillow has least support.
Luggage marketing is about shells. Luggage failure is about wheels, handles and zippers — in that order, reliably, and usually well before the shell shows a scratch.
A bag’s advertised dimensions often describe the body alone. US airline limits, and the metal sizer at the gate, measure everything — wheels, handles and the bulge from overpacking.
The words are used interchangeably in shops and they mean different things. A filter stops bacteria and protozoa; viruses go through it. Where that matters depends on geography.
The number on the box is measured at 3.7 volts inside the pack. Your phone charges at 5 volts or more. That conversion, plus heat, eats about a third of the capacity before you see any of it.
