What you pay
The INIU 20000mAh is $44.99 CAD on amazon.ca. The Power Bank Portable Charger 40000mAh is $65.79 CAD, $20.80 more for double the rated capacity. At that gap, doubling capacity for roughly 46% more money is worth examining carefully.
Raw capacity
The 40000mAh unit has double the rated cells. In real-world terms, both lose 30–40% of stated capacity to voltage conversion and heat, so expect roughly 12,000–14,000 mAh of usable output from the INIU and around 24,000–28,000 mAh from the 40000mAh unit. The INIU charges an iPhone 16 about 4 times; the 40000mAh model gets you closer to 8. For multi-day trips or charging multiple devices without a wall outlet, that gap is real.
Charging speed
Both top out at 22.5W output, so phone charging speed is identical. The INIU supports PD 3.0 and QC 4.0 protocols and charges an iPhone 16 to 70% in roughly 25 minutes. The 40000mAh unit also delivers 22.5W with PD and QC support, hitting around 49% on a smartphone in 30 minutes per its listed specs. Neither bank charges laptops.
Portability and air travel
This is where the comparison turns. The INIU 20000mAh is airline-approved under TSA's 100Wh carry-on limit, you can take it on any flight. The 40000mAh unit is explicitly not allowed on planes; every listing flags this. For Canadians who travel by air, that restriction alone may settle the decision. The INIU weighs around 12–12.8 oz depending on the model variant; the 40000mAh unit runs heavier at roughly 15 oz.
Build and features
The INIU ships with a 3-year warranty, a built-in or detachable USB-C cable depending on variant, an LCD display, and confirmed low-current mode for earbuds and smartwatches. The 40000mAh unit includes built-in output cables and an LCD display, and can charge up to 5 devices simultaneously, one more than the INIU's 3-port setup. Neither carries an IP weatherproofing rating.
Value
The INIU at $44.99 CAD delivers roughly 1,778 mAh per dollar. The 40000mAh at $65.79 CAD delivers roughly 2,430 mAh per dollar, better raw capacity per dollar, but only if you don't fly. If you do fly, the 40000mAh bank stays in checked baggage or at home.