Seven Sparta Cup Holder Expander vs Xspander Cup Holder Expander

The Xspander is the better all-round expander: its twist-to-lock base grips the factory cup holder, and its 4.25-inch opening fits wider bottles and mugs than the Seven Sparta's 3.4-3.8-inch range. The Seven Sparta is a simpler drop-in adapter aimed squarely at 32 and 40 oz Hydro Flasks, with rubber tabs holding the bottle. Owners of the Xspander rate it highly and praise the secure lock; the Seven Sparta's plastic-and-rubber build is the more basic of the two.

• Choose the Seven Sparta Expander if you own a 32 or 40 oz Hydro Flask and want a straightforward adapter that holds it upright.
• Choose the Xspander Cup Holder Expander if you want one adapter for wide mugs, big bottles and slim cans, with a base that locks into the cup holder.