Running belt bum bag 100g slim phone

The essentials

A lightweight running belt bum bag can make a big difference when you want to stay mobile, especially on longer runs. This Waterfly option is designed to carry essentials like a mobile phone, keys, and energy gels without feeling weighed down. Weighing only 100g, it aims to stay comfortable so you can focus on your pace, not your kit. 🏃♂️

With a high elasticity waistband and a secure buckle, the belt is built to resist slipping and sagging as you move. That matters for jogging, marathon training, or gym sessions where you want your hands free. You also get reflective branding for more visible running at night, so your outfit supports safety as well as convenience. 🌙

Key points

It uses an elastic waistband to sit close and move with you, rather than fighting your stride. The buckle design is intended to keep the belt in place, which helps when you switch between jogging and more intense training. There are three compartments, and the main compartment is described as able to fit cell phones of all sizes according to the manufacturer, making it practical for everyday carrying.

The compartment layout is designed to support a logical organisation, so you can store your phone alongside headphones, keys, and energy gels at the same time. A separate headphone jack is included so your music can stay with you during your run, without you having to constantly reach into the bag. For comfort, the fabric is listed as Lycra laminate, and it is described as soft, supple, absorbent, breathable, and lightweight.

It is also described as hand washable, with no pilling, no hardening, and no warping, which is useful if you run frequently. Take note that the manufacturer describes the phone fit in general terms, so if you have a particularly bulky case, it is worth checking how your phone sits inside the main compartment before heading out. 🙂

Tech specs

• Weight: 100 g
• Material: Lycra laminate
• Compartments: 3
• Headphone use: Independent headphone jack
• Safety feature: Reflective logo
• Wash care: Hand washable

What’s the best for runners

It makes sense if you want a slim waist pack that keeps your essentials secure while you exercise. You’ll likely appreciate it during jogging, running, training, hiking, cycling, and gym workouts, because the belt form factor is designed to keep items close to the body. It also suits men and women runners who prefer a belt style rather than a larger waist bag.

You may find it particularly handy when you carry a phone plus small accessories like keys and energy gels, since the compartments are arranged for simultaneous storage. It’s not the best match if you need to transport bulky gear, because the design prioritises a close, lightweight fit over maximum volume. For many everyday workouts, though, it offers a practical way to carry what you need while keeping your movement feeling natural. ✅