Abstract: A modular drinking vessel having a bottom-most base module, a removable intermediate module, and a removably attachable cap module including a mouthpiece and a tethered cap. At least one of the modules has at least one extensible and collapsible handle anchored at both ends to a slide track on the module. Two such handles may be provided on opposed sides of the modular drinking vessel. Alternatively, the drinking vessel may comprise a monolithic cup with at least one such handle, in the absence of intermediate and cap modules.