26 oz double wall 18/8 stainless steel thermal bottle with copper vacuum insulation and threaded stainless steel lid. Double walled insulation keeps hot for 12 hours, cold for 24. Threaded stainless lid twists on and keeps closed. Perfect to toss into your tennis/pickleball bag! Won't break! Won't leak! "Pickleball is my Passion" print available on aqua, lime green, hot pink, and orange.