Abstract: A collapsible travel tumbler is described. The tumbler consists of a collapsible container made of flexible material. The collapsible container is then inserted through a rigid collar, on the top edge of which the collapsible cup sits. A lid with a sealable drinking hole is then screwed onto the collar, providing a complete and secure closure of the collapsible tumbler. When not in use the collapsible container can be collapsed into the housing created by the combination of the collar and the lid for easy storage and transport.