The £5.99 Bum Bag Where Your Waist Size Decides Everything

Why the same bag gets called both too big and too small

If you read the reviews back to back, the contradiction jumps out fast. Klaudia (1 star) writes that her usual size is M and "even on the smallest setting this one is still too big." Donna (2 stars) says it is "too big for my size 10/12 waist" and she could not make it smaller. Yet plenty of others wear it happily, and Rebecca Smith (5 stars) calls the adjustable belt fine for "most sizes (I'm size 14)."

The pattern underneath is simple: this belt is generous. It is built to stretch around a larger waist or to be worn cross-body, and that is exactly where the complaints come from. The listing quotes a minimum of about 87cm, but several reviewers say the real-world minimum is longer than they expected. Mart (4 stars) measured it: "the adjustable strap has a minimum size of approximately 100cm, not the 80cm described, making it too large for slimmer people." deborah (2 stars) reported the same gap, saying the stated 80cm minimum was actually closer to 96cm on hers.

So if you are petite or a smaller dress size and you want this snug around your waist, go in with eyes open. The fix that keeps coming up is to wear it across your body instead. Gill (4 stars) sums it up: the straps "are very long so if you are less than a size 14 ladies this is going to fall off you, although perfect for wearing across your body as a strappy bag."

The phone test that settles the size argument

The capacity rows split the same way, and here too there is a clean rule of thumb. This is a small bag with one main compartment and one narrow front pocket. If you pack like a minimalist, it is roomy. If you carry a big phone plus a wallet plus more, it gets tight.

Cw (1 star) is the worst-case data point: "I can just about fit my iPhone 16 pro max in there and nothing else." A large modern phone really does eat most of the main pocket. But look at what the happy reviewers are actually carrying and it is lighter loads. jackie2735 (4 stars) fits "phone, keys, lippy and my inhaler" with a separate zip pocket for notes and a bank card. Nikki B (5 stars) packs "mobile phone, poo bags and other items" for dog walks. Ben & Ellie (5 stars) even squeezed in a water bottle at Disney World.

The front pocket is the real weak spot for storage. Rachael (5 stars) calls it "very narrow, but still useful for a packet of polos," and Dianna (2 stars) says it only holds a strip of paracetamol. Treat the front pocket as a keys-and-tissues slot, not a second main compartment, and you will not be disappointed. The other thing worth flagging: Amazon pools the colour variants here, and a couple of reviewers of the grey version (River, 4 stars) found theirs "larger than I expected." Capacity perception varies, so buy for the lighter end of what people report, not the best case.

Build quality at a fiver: chunky zips, thin lining

For the money, the construction surprises people on the upside more often than not. The phrase that comes up again and again is "chunky zips." Jay Jay (5 stars) describes "strong, chunky zips" on both pockets and a "well made click fastener." Julie (5 stars) notes the "large zips" and two sections. The fabric is water-resistant rather than waterproof, and that holds up in light UK drizzle: Val (4 stars) says it "held up well even in light rain, kept all my essentials dry," and Noah (5 stars) reckons "rain just falls off it." The body is lightly padded too, which several reviewers count as a bonus at this price.

It is not flawless, and the complaints cluster in two places. First, zips arriving broken: Polly Bee (1 star) and Anlsa (2 stars) both received bags with a zip already broken out of the box. Second, the inner lining that divides the two sections. Mary G (4 stars) found "the inner lining that separates the two sections came apart not long after first use," and Sandy (3 stars) got one with a split lining on arrival. Nicole (1 star) had hers rip after the third wear. These are not universal, but they are the recurring durability gripes, so check yours over on day one while a return is easy. To be fair, the returns process itself gets praise: Fatema Alansari (5 stars) had a collection arranged for the very next day.

One security flaw worth knowing before a festival

This one deserves a callout because it changes how you wear it in a crowd. Sarah (1 star) makes a sharp point about the buckle: it fastens at the back rather than at the front next to the pouch. Her worry is that "someone could easily come up behind you, squeeze together the buckle edges" and the whole thing is gone. For a bag people specifically buy to keep valuables safe in busy places, that is worth thinking about.

The good news is the design still works for security if you wear it the way many reviewers do: cross-body or chest-front, so the pouch and the clip both sit where you can see them. Jay Jay points out you can "fasten it under a long coat, or sling it across your shoulder" as a safer alternative to a handbag. Patricia C (5 stars), who is disabled, chose it precisely because it is "hard to be snatched." So the buckle position is a real flaw, not a dealbreaker, as long as you do not wear it slung behind your hip in a packed crowd.

Where it actually shines: the use cases reviewers keep buying it for

Strip away the size debates and a clear list of jobs emerges where this bag just works. Dog walking is the runaway favourite. Pauline (5 stars) uses it for "holding dog poo bags and biscuits," LouiseMM (5 stars) bought it specifically for dog walks, and Richard Lea (5 stars) takes his Irish Setter out with it. Mrs S. (5 stars) even uses it for dog-training treats.

Holidays and travel come a close second, because it saves you lugging a handbag. Janette spence (5 stars) loved "not having to take a handbag" abroad, and Rachael keeps her passport, money and phone close and "quite safe." Then there is the events crowd: K. Fraser (5 stars) wore it to a concert, Lynne Tyers (5 stars) rates it for music festivals, and michelle jones (5 stars) ran Race for Life in it. For camping specifically, set your expectations to a light day-carry rather than serious trail kit. Penny Wallace (5 stars) found it "more suitable for camping than a handbag" with room for a small purse, phone and glasses, which is about the right expectation. It is a campsite-and-day-walk pouch, not a hiking hip pack with litres of storage.

Our verdict and who should skip it

At £5.99 the maths is easy. The 100 most-recent reviews average 4.16 stars, with 60 of them at five stars and a small cluster of one and two-star ratings driven almost entirely by strap length, capacity expectations, and the occasional dud zip or lining. None of those are mysteries. They are predictable, which means you can buy around them.

Buy it if you want a cheap, hands-free pouch for dog walks, holidays, festivals, light campsite carry or keeping valuables close in a city, you carry a modest load (phone, keys, cards, a few bits), and you are happy to wear it cross-body or you are a size 14 or above for a snug waist fit. Skip it if you are petite and set on wearing it tight around the waist, if you carry a large phone plus a wallet plus extras, or if you need a front-fastening buckle for crowd security. Set those expectations right and it is a lot of useful bag for the price of a sandwich and a coffee.

Our rating: 4 out of 5. Useful and great value, marked down a notch for the long-strap fit issue and the hit-and-miss lining.