The size thing is real
Most 10000mAh power banks feel like you've packed a small paperback. The INIU is noticeably more compact, and that 40% smaller claim isn't just marketing fluff. Slipped it into a jeans pocket before a long train journey and it didn't pull the waistband down. That alone matters more than any spec sheet.
45W output is also properly fast. Topped up a nearly-dead phone to 80% in under 40 minutes. Not bad at all for something this small.
Who this is actually for
If you're a daily commuter, a light traveller, or someone who keeps forgetting to charge overnight, this is spot on. It's not a weekend festival battery where you're trying to keep four devices alive for three days. 10000mAh is one full phone charge, maybe a top-up for a second. Know that going in.
Personally, I wouldn't rely on this as a sole power source for a long-haul flight. But as the thing that lives in your work bag or coat pocket? Proper good.
One honest reservation
The brand isn't one everyone knows, and the Amazon listing is sold via a third-party seller (SimpleLife LLC, fulfilled by Amazon). That's not necessarily a red flag, but it's worth keeping an eye on return logistics if anything goes wrong. The community heat on this one is high, which suggests real people are buying it and not screaming about it afterwards. That counts for something.
At this price, the risk is low. Just don't expect a premium unboxing experience.