The one thing that actually matters here
Ryanair's 40x20x30cm underseat allowance is famously unforgiving. Get it wrong and you're paying gate fees that cost more than some short-haul flights. So when a bag lands at under eleven quid and actually hits those dimensions with 24 litres of capacity, it gets attention. The HotUKDeals community clearly agrees, 805 degrees of heat is not nothing.
Personally, I'd picture this as the bag you grab for a long weekend to Porto: a change of clothes, your toiletries bag, a light jacket stuffed down the side. That's about the realistic limit. Don't expect to pack for five days.
Who this is and isn't for
If you fly Ryanair a handful of times a year and hate paying for hold luggage, this makes sense. It's a backup bag, a spare, something you keep by the door. At this price point you're not buying craftsmanship or longevity. You're buying compliance with an airline's awkward rules without spending twenty-five quid on a branded alternative.
Not for you if you need something that'll last years of regular travel, or if you want padded laptop protection. There's no mention of structured panels or proper organisation beyond the main compartment.
The honest reservation
No brand name really to speak of, no clear returns history to lean on. Sold via FBA which helps slightly, since Amazon handles returns. But at this price, the risk is low enough that most people won't lose sleep over it. Spot on value for what it is, just go in with realistic expectations.