Portland Design Works Sparrow Cage - Black side-entry water bottle cage, 54 g lightweight aluminum

Built from a single sheet of 5052 aluminum and trimmed with diamond cutouts, this Sparrow Cage combines a minimalist silhouette with clever engineering to give riders easy access to bottles on tight frame spaces. At just 54 grams (1.9 oz), it’s one of the lightest cages available, yet the formed body applies consistent pressure to keep bottles locked in place over rough roads and singletrack. It ships with stainless steel mounting bolts and is backed by Portland Design Works' lifetime warranty.

How does the Sparrow Cage provide easy bottle access on small frames?

The Sparrow Cage uses a side-entry design that lets you slide a bottle in and out from the side rather than the top. This is ideal for frames with limited space between the downtube and the seat tube, or for small-size frames where traditional top-entry cages are hard to reach.

• Side-entry geometry for easy reach on compact frames
• Works well when two cages are mounted close together
• Low-profile shape avoids contact with knees and shifters

Will such a lightweight alloy cage hold my bottle securely on rough terrain?

Yes—the Sparrow Cage is stamped and formed so the body wraps the bottle with even pressure, preventing rattling or ejection on bumpy rides. The diamond cutouts reduce weight without compromising structural grip, and the cage’s spring and lip geometry help retain different bottle sizes.

• 5052 alloy body provides resilient spring tension
• Diamond cutouts balance weight reduction with strength
• Engineered lip keeps a range of bottle diameters secure

How simple is installation and can I mount multiple cages?

Installation is straightforward: use the included stainless steel bolts to fasten the cage to any standard bottle boss or an aftermarket adapter. The Sparrow Cage’s side-entry profile makes it practical to mount multiple cages on both the downtube and seat tube while still allowing consistent access from the same side.

• Comes with stainless steel mounting bolts for quick install
• Compatible with standard bottle bosses and adapters
• Designed for mounting multiple cages and staggered setups

What aesthetic and practical variants are available?

Portland Design Works offers the Sparrow Cage in several playful, animal-inspired shapes and finishes, including this black version that delivers a matte, understated look. The cutouts and profile give the cage visual character while remaining fully functional on road, gravel, and mountain bikes.

• Animal-themed silhouettes for personality on the bike
• Black finish for a clean, low-visibility appearance
• Lightweight design that complements performance-focused builds

Who is this for? The Portland Design Works Sparrow Cage is aimed at cyclists who want a reliable, ultra-light bottle cage that solves space and access issues—small-frame riders, gravel and bikepacking cyclists with multiple bottle mounts, and anyone who values a low-weight, stylish accessory. If you need easy side access, dependable retention, and a playful look without adding bulk, this cage is a practical upgrade.