You need a registered Kindle, but you don't need to actually use the Kindle to make it work. Just download the ebook from the Amazon website "for Kindle XYZ" and then import and convert the ebook in calibre.
This is unfortunately the closest answer to what the OP is asking.
To the best of my knowledge, outside of independent authors like Cory Doctorow selling drm-free from their own sites, I'm not aware of any place to shop for ebooks that are not tied to some online DRM scheme.
Humble Bundle books are another option, but it's highly dependent upon if you want what they're selling.
Also works on kobo books which use adobe digital editions. I think the plugin is called obok (I've only just realised that kobo is an anagram of book haha)
OP wants to avoid Amazon. This is still giving Amazon money and therefore encouraging Amazon's greed, walled garden and dark patterns.
A better alternative would be using almost any other digital book seller. There's plenty. And if the author chose or was forced to only sell through Amazon, then you can try library sources (like Overdrive) so the author at least gets something. And if you still can't get what you're looking for, then it's time to sail the high seas.
Have you contacted Thule? M not even joking. I have an 11 year old Thule laptop backpack, the little rubber covers on the zipper handles perished. I called them to ask if there were replacements available and they said to bring it in and then replaced them for free.
I wouldn't call 8 years a great backpack. I have a North Face backpack that has seen heavy abuse and is still good to go after 19 years. So maybe check out North Face, assuming they're still making them like they used to.
Do you hate money but love backpacks? Then check out Hillpeople Gear. I have a Connor, but Umlindi might be up your alley. They're not light backpacks, but they're sturdy and the load bearing system is second to none. Super comfortable even without a hip belt.
Also check out Mystery Ranch. If you can find a used one that's be best, but even after getting bought by Yeti they still make really good shit.
I went with Trash Bags when picking a new bag about 6 years ago. No complaints. It's one of the best things I own. I've ordered other small stuff from them and it's always been superb quality.
I've got a victorinox that I've had for almost 20 years. I got it in school, and it lasted several years with almost 50lbs of books in it (yes, really. It was a private school).
One strap gave way in the first year, but my mom restitched it and everything else has held since. Only other people I have is that it smells kinda funky because I can't figure out how to wash it.
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