The TrailFlex UltraPack Bottle delivers hydration without bulk, making it the best collapsible water bottle for hiking and active travel. Weighing just 3.2 oz, it’s 50% lighter than traditional hard bottles and flattens out when empty to fit effortlessly in backpacks or jacket pockets.
- Compatible with 42mm threaded backcountry filters — ideal for remote trails (see reviews of backpacking water bottles with filter compatibility).
- Built from abrasion-resistant TPU with reinforced RF-welded seams for outstanding durability.
- High-flow twist nozzle with dust cover lets you hydrate quickly with one hand.
- Wide temperature range: freeze it or fill it with hot liquids up to 140°F.
- Top rated BPA free hydration flask — safe, odorless, and PVC-free construction.
How to clean: Simply rinse with warm soapy water or use bottle cleaning tablets. Bottle is safe to freeze for easy deep cleaning.
Jonathan Phillips (verified owner) –
Absolutely love this bottle — fits in my hiking vest perfectly. Super light and folds down small for weekend backpacking.
Alexandria Manning (verified owner) –
I bought it for travel and it’s now my go-to hydration flask. No plastic taste, and easy to clean. Easily the best collapsible water bottle for hiking I’ve used.
Elizabeth Kim (verified owner) –
Used with my filter cap during a 4-day trail run. Reliable, lightweight, and strong. Glad I picked this backpacking water bottle over bulkier options.