A CUP HOLDER FOR BOTTLES & MUGS THAT WON'T FIT  The Ultimate Expander™ installs into your vehicle’s cup holder in seconds and holds your water bottle, thermos, or mug in a firm, snug fit. Travel with your version of YETI, RTIC, Milwaukee, Nalgene, Hydro Flask, CamelBak, and more. Holds any bottles or mugs from 3.4" - 4.0" in diameter.  OFFSET AND HEIGHT ADJUSTABLE  Offset the base from the expander to keep the adjacent cup holder open. This also allows two Ultimate Expanders to fit next to each other in most dual cup holder applications. Recessed or covered cup holders? No problem! We also include two spacers that can increase the height by 1" each. Between the height and offset adjustability there isn't a vehicle the Ultimate Expander will not work in.  STAYS FIRMLY IN PLACE Enjoying a bit of rough terrain? An adjustable base is the only way to keep an expander and oversized bottle firmly in place. The Ultimate Expander features a 3-ring expandable base with a diameter range of 2.5”-3.75” to keep it firmly in place, regardless of terrain type. We have the only expandable base with built-in, silicon grips. Competitors use cheap, glued-on grips that immediately fail in any hot vehicle. Once these fail, the product is useless.  DRINK FROM YOUR FAVORITE MUG The Ultimate Expander features an integrated mug handle slot so your favorite mug fits in with ease. Fit your 14oz YETI Rambler, 24oz YETI Rambler, most standard household coffee mugs, and many more. SIMPLE INSTALLATION & A UNIVERSAL FIT It couldn’t be easier! 2 steps & 5 seconds is all it takes to fit your vehicle's cup holder with the Ultimate Expander. Simply hold the base and twist the top. The base will retract or expand to custom fit your cup holder. No tools, no hardware, no problem. Every vehicle should come with one of these! Did we mention it makes an excellent gift?