Sea to Summit Frontier Ultralight Collapsible Cup

Sea to Summit Frontier Collapsible Cup

When every ounce and every cubic inch in your pack matters, the Sea to Summit Frontier Collapsible Cup delivers full-function performance without taking up valuable space. Built on more than a decade of Sea to Summit’s expertise in collapsible drinkware, the Frontier Cup refines the concept with improved ergonomics, greater stability, and a lighter, more packable design—ideal for long-distance hikers and minimalists alike.

The cup’s EU food-grade silicone sidewalls compress down to less than 2 cm in height, allowing it to disappear into a pocket, cook kit, or pack lid when not in use. Unlike flimsy collapsible cups, the Frontier is reinforced where it counts. The base, rim, and center ring are constructed from glass-reinforced nylon 66, giving the cup structure, durability, and a confident feel in the hand—whether you’re sipping morning coffee or rehydrating at a midday water stop.

The rigid rim and center ring also improve grip and help shield your fingers from heat, making hot drinks more comfortable in camp. Its thoughtful design allows the cup to nest and stack easily with other Frontier components, keeping your kit organized and compact.

🏔️ Perfect For PCT Hikers

• Southern California & Desert Sections: Collapses flat and stashes easily after water stops—no wasted space in your pack

• Ultralight & Thru-Hike Setups: Adds real camp comfort with virtually no bulk or penalty

• Hot Drinks in Camp: Reinforced rim and center ring make morning coffee or tea easier to handle

• Long Miles, Simple Systems: Nests neatly with cook kits and disappears when not in use

Whether you’re grabbing a quick drink at a cache, sipping electrolytes on a break, or enjoying a hot cup at camp, the Sea to Summit Frontier Collapsible Cup fits seamlessly into a streamlined PCT kit.

Why We Like It

• Ultra-compact: collapses flat to under 2 cm

• Stable and easy to hold thanks to reinforced nylon structure

• BPA-free, food-grade silicone for safe drinking

• Comfortable with hot beverages

• Nests and stacks for efficient pack organization

From desert water stops to alpine mornings on the PCT, the Frontier Collapsible Cup proves that smart design beats bulky gear every time.