Lots of great comments. Companies with great warranties, that I've dealt with:
Osprey - they have stood behind their "Allmighty Guarantee" even for user stupidity. Had one shoulder strap rip out of a pack when a friend went down badly in TOM. Asked them if they could fix it at my cost, and they sent me a new pack (with a new bladder as well!). Sent in several photos of broken buckles asking where can I get replacements, they simply put several spares in an envelope and sent them to me!
Mountain Hardware - Ski jacket zipper failed after 6 years, they declined to replace the zip, but gave me a voucher to choose a replacement! I have one of their experimental packs, the Solitude, 10 years old at this point. But just after I'd bought it, a rat chewed through a side pocket on the Torres Del Paine trail. I mentioned it when discussing the jacket issue and great MH products I've had. By then it was out of production, a "historical" pack and they offered to make it as new! I declined as it was my fault for leaving food in the pocket and I'd fixed it with a trail badge.
Different Bikes - Warrantied so many early reverb dropper posts for me I lost count. Would take the bike in and ask them to repair, and most times they got a new dropper. Warrantied several Shimano SPD XT/XTR pedals that came off the spindles. I had a great relationship with them. Their resurrection as Comor has been great, but I've had nothing to take in for warranty recently.
Kona Warrantied my Honzo Ti frame after it cracked.. After 4 years of riding, it didn't really owe me anything, but I was most grateful to get a brand new bike in return! Took a while as I didn't have an original receipt and Different bikes no longer exists, but the eventually honoured their lifetime warranty on the frame.
BikeYoke/Wheelthing warrantied this "unbreakable" dropper post that I managed to break several times... " Is he riding a hardtail" was the comment from BikeYoke