UGREEN's latest accessory is categorized as a power bank, albeit with one of such a large rated capacity that it needs its own handle. It also packs potentially camping- or holiday-friendly perks such as a Smart Digital Display, emergency LED lighting and triple USB-C ports that can charge at up to 140 watts - or 100W each even when all three are in use.https://www.notebookcheck.net/UGREEN-s-latest-Portable-Charging-solution-debuts-to-deliver-48-000mAh-of-power-at-up-to-300W.840079.0.html
Finally a promising looking product in this form factor. There have been a few very similar products on amazon, even with the handle, but with the usual bad reviews because of high failure rate and/or low quality cells. Lifepo4 is also really cool to see in this form factor, should be pretty durable compared to li-ion.
Article says it can charge a M2 Macbook Air 1.1 times over. The Macbook seems to have a 52.6w/h or 66.2w/h battery depending on 13 or 15" model and this article states that the powerbank has a 153w/h so it should be able to charge it well over 2x even with accounting for losses AND the larger 15" model battery. Not sure how you worked that out.