AER / Day Sling 4 Max Ultra

AER
Founded in 2014 and based in the San Francisco Bay Area. Aer’s modern, functional bag collections are designed for professionals, athletes, and travelers moving through ever-changing cities.

Fifteen times stronger than steel. The extraordinary specs of Ultra400X.
Constructed with Ultra400X from Challenge Sailcloth, this advanced material offers abrasion resistance that surpasses conventional nylon while being approximately 20% lighter.

A high-tech fabric made with UHMWPE (ultra-high-molecular-weight polyethylene), it delivers 15 times the strength of steel while offering excellent water resistance. It helps protect contents from light rain, making it ideal for everyday use.

Note: The surface of the fabric may show marks resembling wrinkles or creases. This is a natural characteristic of Ultra400X and does not indicate a defect. Thank you for your understanding.



The interior features a lightweight nylon ripstop liner. Tear-resistant and built to be tough inside and out, it is made to last.





Functional beauty in every part
The main compartment and front pocket feature water-resistant zippers, providing reliable protection in sudden bad weather. All zippers are made by trusted YKK.



Large capacity that can also store a tablet
The main compartment opens wide and can store a wallet, power bank, and small items in an organized way. Inside, a padded tablet pocket fits devices up to 11 inches, allowing safe carrying of mini tablets and e-readers.



A hidden pocket for a smart tracker is included for added peace of mind in case it gets lost. The keychain is removable, allowing you to reposition it depending on the situation or how you use the bag.



A storage system that makes items easy to manage
The front features a quick-access pocket for card cases and small items. Internal dividers allow frequently used items to be separated by purpose.



The rear panel features a security pocket that keeps it hidden when worn. It allows you to carry valuables such as a passport, wallet, or card case close and secure, while still providing quick access when needed.



Subtle side belt loops are included, ideal for securing sunglasses. The bag also features a hanging loop for convenient storage when no hanger is available, reflecting thoughtful, modern utility down to the smallest details.



Supports smooth movement
The shoulder strap is adjustable, allowing fine tuning of the fit according to body shape and style.

The buckle uses FIDLOCK, an innovative magnetic part from Germany. Its sliding design can be removed easily with one hand by pulling the handle, and when attached, the magnetic force holds it securely in place.

Other parts are unified with highly durable Duraflex components, also used in military equipment. Every detail is finished with uncompromising quality built for tough use.



A top handle that is easy to grip supports the seamless actions of hanging, setting down, and carrying. It allows quick switching to hand carry on crowded trains or easy grabbing during sudden movement, giving a light-footed feel in daily situations.





Compact, yet more useful than it looks.
With a capacity of approximately 6L, it is compact yet offers more storage than it appears thanks to a carefully calculated pocket layout. Its timeless design and functionality suit any gender or age, making it recommended not only for yourself but also as a gift for someone special.

Built tough in every detail, it is designed for heavy use while keeping you light on your feet across all situations, from daily use to a travel companion.