Waterfly Bum Bag/Fanny Pack with 5 Zipped Compartments (Large) for Running, Hiking & Everyday Carry

What it is and why people buy it

This Waterfly bum bag (also worn crossbody) is built around one simple idea: you want your essentials split up, not all jumbled together. It comes with five separate zipped pockets of different sizes, so you can keep smaller valuables separate from items you grab more often. On paper, it’s aimed at people who do a bit of everything—commuting on foot, running, hiking, cycling, or heading out to places like fairs and concerts where a big bag is just overkill.

What stands out in use

The headline feature is organisation. The largest compartment has a big internal layer and is described as able to hold a standard 500ml water bottle, which is a useful benchmark if you’re taking shorter training sessions or day walks. Next to that, there are smaller sections intended for a mobile phone, cards, wallet and keys, plus front pockets for items you want close at hand.

There’s also a “wear it your way” angle. The adjustable nylon belt is designed to fit a wide waist range (up to 16–52 inches / 41–132cm), and the reflective strip at the end of the strap is there for better visibility when you’re out at night. The back is padded with an anti-sweat design, and the outer is water resistant to help with raindrops and sweat.

That soft, padded back matters more than you’d think—especially if you’ll carry it for an hour or more. You can get through an evening run or a cycling ride without feeling like you’re pressing a hard bag into your back.

The less convincing bits to consider

It’s not perfect, and a few limitations are worth noting. First, it’s water resistant rather than waterproof, so if you regularly expect heavy rain or you’re doing long sessions in bad weather, it may not be the safest choice for electronics. Second, while the bag is described as “fits all sizes” and is made to work for men and women, whether it feels truly comfortable for you will depend on your body shape and how tightly you set the belt.

Finally, it’s a large waist pack by dimensions and pocket layout, but it’s still a belt bag. If you’re expecting to carry bulky kit, it may feel cramped compared with a dedicated daypack.

Key features that affect day-to-day value

Five zipped compartments are the real practical win here—separate storage tends to reduce fumbling when you’re out and about.

The materials and comfort touches also point in the right direction: nylon fabric described as chafe-resistant, a breathable anti-sweat back pad, and a soft padded back for reducing carry pressure. If you’ve used cheaper belt bags that feel rough against clothing or sit uncomfortably, this is the type of feature set that’s meant to address that.

There’s also a small personalisation option: a patch pocket on the front that can be customised to your liking.

Who it suits (and who might skip it)

It’s a solid pick if you want a single bag for both everyday errands and active use, without needing to keep swapping pouches. It suits people who: - run, hike or cycle and want quick access to essentials - like keeping phone/keys/wallet organised in separate zipped sections - prefer a bum bag that can also be worn crossbody - sometimes carry a water bottle and want it placed securely in the biggest pocket

It may not suit you if you need fully waterproof protection, or if you’re carrying larger daily items that won’t fit into a compact waist-pack format. Also, if you dislike belt-style carrying altogether, you may find a sling or a small shoulder bag approach more comfortable.

How to use it in a realistic scenario

Imagine you’re heading out for a 45-minute run: you could put your mobile phone and keys in the smaller zipped pocket(s), keep your wallet/cards in the section meant for cards/wallet, and place a 500ml water bottle in the largest pocket. For a night run, the reflective strip on the strap is there to help visibility. After you finish, you can reuse the same setup for an errand run—grab the front pockets for items you reach for most, and leave the rest zipped away.

Final verdict

Is it worth it?

Worth considering if your main goal is organised carry in a compact, active-style bum bag. The five-pocket layout, described 500ml bottle capacity in the largest compartment, adjustable fit range, reflective strip, and the anti-sweat padded back are all features that line up with running, hiking, commuting on foot, and casual outdoor days.

You might want to skip it if you need fully waterproof storage, or if you regularly carry bigger items than a belt bag can comfortably handle. In that case, you’d likely be happier with a larger pack format.

Mini FAQ

FAQ

Will it hold a 500ml water bottle? The largest pocket is described as able to hold a standard 500ml water bottle.

Is the bag suitable for both men and women? Yes—it's described as unisex and designed for men and women.

Is it comfortable for longer wear? It has a soft padded, anti-sweat back pad. That said, comfort still depends on how you adjust the belt and what you pack inside.

How water resistant is it? It’s described as water resistant against raindrops, sweat and moisture, but it’s not presented as waterproof.

Can it be worn crossbody? Yes, it’s not only a waist pack, it can be worn crossbody for walking, running, biking and more.