No favorites as such. My oldest piece of gear I still use are a pair of REI mid weight synthetic long johns I bought in the mid eighties and have use variously for sailing, skiing and backpacking.  My activities have been intermittent so the longevity is not quite as impressive as it seems. My 10 year old Gregory Baltoro 70 pack is still very comfortable for carrying 7 days of food in a bear can. At 5.6#  it is heavy by today's standards but it's the last thing I would change out. Weight distribution is as important as absolute weight.  I was very pleased with my Exoffico give and go briefs,  Darn Tough wool blend boot socks and Glacier Glove Ascention Bay sun gloves all new this year.. Also new this year, my Big Agnes Tiger Wall 2UL worked well in Desolation Wilderness and on the JMT for both 1 and 2 people.A slightly  more unusual piece of gear that worked well and I will continue to take is a Brondell GoSpa personal bidet.