Looking to buy some of these down warmth items used if possible to save some money. Will need gear that is in good condition. I am going on a trip to climb a 7,000 meter peak, so I'm looking for items that could handle that and potentially a future trip to Denali. Let me know if you have anything that may fit the descriptions.

I'm 6'3 and pretty slim, so probably looking for size L or long sleeping bag if possible

Thanks!