The Anker Prime is a hefty power bank, measuring 6.4"x2"x2.2" and weighing in at 1.5lbs. It has two USB Type-C ports and one USB Type-A port. Each USB Type C port supports up to 140W of Power Delivery or a combined total of 240W (140W + 100W) if you're running both simultaneously. That's powerful enough to charge even the current Apple MacBook Pro 16" laptop, which accepts up to 140W of charging. In terms of gaming handhelds, the Steam Deck supports up to 38W of charging, the Asus ROG Ally X and Xbox Ally X up to 100W, and the Nintendo Switch up to 18W. Basically, that means the Anker Prime can easily charge all three gaming handhelds at their maximum rate. The USB Type-A port supports up to 65W, although it drops to 18W if you're using the other ports at the same time.
A 27,650mAh battery equates to a 99.5Whr capacity. An 80% power efficiency rating (which is about standard for power banks) gives you about 80Whr of available charge. That's enough juice to charge the Asus ROG Xbox Ally X, which has an 80Whr battery, from completely empty to completely full. Other handhelds can be charged more than once.
The Anker Prime is TSA-approved, but just barely.
TSA states that power banks must be under 100Whr in capacity for carry-on (check-in is not allowed under any circumstances). This Anker Prime is just barely under that at 99.5Whr, but that is the nominal rating and in real-world testing, it will always be below that. You might get checked simply because the Prime 27,650mAh is a hefty-looking power bank, but you shouldn't have any problems getting it cleared.
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