According to the latest bound, proved in 2004 by Imre Ruzsa of the Alfréd Rényi Institute of Mathematics in Hungary, a sum of 1020 cosines — that’s a 1 with 20 zeros after it, about the number of molecules in a cubic inch of air — must have a minimum value smaller than about −7.
The Calpak Luka Mini Softside Carry-on feels more like a plush weekender than a spinner, and the Bagsmart Hardside Carry-on zips open clamshell-style and never fights me at TSA.
—
Brandon Schultz,
Travel + Leisure,
6 Feb. 2026
Primaloft Black Eco insulation kept me toasty on 15-degree lift rides at Bolton Valley Ski Resort, while extra-long flank zips are great for dumping heat on the way down.
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