Store › YETI Rambler 24oz Stackable Mug Image 1 of 1 YETI Rambler 24oz Stackable Mug $0.00 The Rambler’s double-wall vacuum insulation holds the cold on warm days and keeps the heat when the weather gets chilly. Add To Cart Added! The Rambler’s double-wall vacuum insulation holds the cold on warm days and keeps the heat when the weather gets chilly.