【Universal Compatibility】Designed for tumblers up to 4in diameter, including Stanley 30&40oz and other. Features a dual-ring mechanism that adjusts to securely hold handled cups upright, preventing spills and keeping your bag pristine. 【Handle-Lock Technology, Shake-Proof Stability】Innovative split-ring design grips handles tightly, staying rock-solid during workouts, hikes, or chaotic days. Surf waves, cheer at games, or sprint through errands—your drink stays steady, zero sloshing! 【Instant Attachment to Any Tote】Universal single-nut screw system fit for Bogg Bags, Simply Southern, and all bags with standard grommets. Mount externally for quick access or internally for multi-cup storage—no Velcro or straps required! 【Spill-Proof & Space-Saving】Aerospace-grade lightweight yet rugged build. Free up bag space by mounting 40oz tumblers outside, or use the internal tiered holder to store 4 drinks vertically. Perfect for sports moms, travelers, and outdoor adventures. 【Compact and Lightweight】Compact design makes it easy to carry and store, while the lightweight construction ensures it won't add extra bulk to your gear. Cup Holder