In terms of portability, the MacBook Air (2025) 15.3″ holds a meaningful advantage. At 1,510 g and just 11 mm thick, it is noticeably lighter and slimmer than the Lenovo IdeaPad Slim 5 Gen 10 16″, which weighs 1,760 g and measures 16 mm thick. That 250 g difference is perceptible over a full day of carrying the machine in a bag, and the 5 mm difference in thickness has a real impact on how the laptop fits into sleeves and tight compartments. The volume gap reinforces this story: the MacBook Air occupies roughly 886 cm³ versus the IdeaPad's 1,460 cm³ — nearly 65% more volume for the Lenovo — despite the IdeaPad offering only a marginally larger screen.
A significant engineering differentiator is thermal design. The MacBook Air relies on a fanless design, meaning it has no moving parts for cooling. This translates to completely silent operation at all times, which is valuable in quiet environments like libraries or meetings. The IdeaPad Slim 5, by contrast, uses active cooling with a fan — which can manage sustained workloads more aggressively but introduces audible noise under load. Whether this is a disadvantage depends on use case: for users who prioritize silence, the fanless MacBook Air wins; for those who need sustained peak performance without thermal throttling, active cooling may be preferable, though the provided specs do not speak to performance headroom directly.
Both laptops share a backlit keyboard and neither offers weather sealing, so those factors are a wash. Overall, on the design axis, the MacBook Air (2025) has a clear edge in portability and form factor compactness, while the IdeaPad's active cooling is the one design trait that could appeal to users prioritizing thermal sustained performance over silence and thinness.