Alaska is about 1.8 times bigger than Namibia.

Namibia is approximately 824,292 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 80% larger than Namibia. Meanwhile, the population of Namibia is ~2.7 million people (2.0 million fewer people live in Alaska).
Tip: This to-scale comparison of Namibia vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.