The Reliable Core
Across almost every location type, a small group of products carries the machine:
- Bottled water. Usually the single highest-volume item, and among the best margins. Never let it run out — an empty water slot costs you more than any other.
- Mainstream cola and lemon-lime. Brand recognition does the selling. Own-brand cola saves pennies and costs vends.
- Energy drinks. Lower percentage margin, high dollar margin, and strongly habitual. Excellent in warehouses, gyms, and anywhere doing shift work.
- Salty snacks. Chips and similar. Highest impulse rate of any snack category.
- Chocolate and candy bars. Steady, recognisable, and forgiving on shelf life.
That's roughly your first ten to twelve slots, and it's deliberately boring. Vending is not the place to be interesting: people buy what they recognise when they're in a hurry.
For how to split the machine between proven sellers, premium items, and tests, the 60/30/10 approach in the getting-started guide is the framework — this page is about what goes in each bucket and what to throw out.
What Changes by Location
The core stays; the rest should shift substantially with the site.
| Location | Skew toward | Skew away from |
|---|---|---|
| Gym / fitness | Protein bars, sports drinks, water in larger sizes, low-sugar options | Chocolate, full-sugar soda |
| Warehouse / manufacturing | Energy drinks, larger portions, coffee, substantial snacks | Delicate or meltable items |
| Auto repair / dealership waiting | Soda, coffee, chips, chocolate — classic waiting-room comfort | Anything needing refrigeration beyond drinks |
| Office | Coffee, healthier snacks, variety over volume | Bulk portions |
| Laundromat | Cheap, fast, familiar — soda, chips, candy | Premium-priced items |
| Hospital / medical | Water, coffee, low-sugar options, familiar comfort snacks | Novelty items |
| Hotel (guest-facing) | Water, soda, snacks in travel sizes | Bulk multipacks |
Two patterns worth internalising:
Blue-collar and shift-work sites reward size and caffeine. People are working physically for eight to twelve hours. A bigger portion at a higher price outsells a small one.
Fitness sites are the one place healthy options genuinely outsell candy. Everywhere else, "healthy vending" tends to mean *offering* the option, not building the machine around it.
What Reliably Doesn't Sell
This list is more valuable than the bestseller list, because dead slots cost you twice — once in the capital sitting there, and once in the vend you didn't make.
- Anything that melts. Chocolate in a machine near a window, a loading bay, or in a hot climate becomes a mess and a refund conversation.
- Unfamiliar brands. Shoppers browse in a supermarket. In front of a vending machine they scan for something they already know and buy it. Unknown brands get skipped, not tried.
- Gum and mints. Low price point, low margin, and they occupy a slot that could hold a $2 item.
- Diet variants beyond one or two. One diet cola sells. Four diet options split the same small demand and all move slowly.
- Healthy items in the wrong location. A protein bar in a laundromat is a slot doing nothing.
- Very large or oddly shaped packages. Jam risk, and they eat the space of two normal items.
- Short-dated perishables, unless you're on a genuinely tight service cycle and can face the shrink.
The common thread is that a slot is scarce. Judge every item on what a better item in that slot would have earned, not on whether it occasionally sells.
Let the Data Cut the Losers
Intuition about what sells is unreliable — including yours, and including mine. The machine knows.
After about six to eight weeks at a location, you have enough to act on. Work out, per slot:
1. Vends per week. Anything below roughly one a week is dead space at most locations. 2. Gross margin dollars per week — vends × margin, not vends alone. A slow $3 item can beat a fast $1.25 one. 3. Position. Eye-level and centre slots outsell corners substantially. Before you cut a product, try moving it. Plenty of "bad products" are just badly positioned.
Then run a simple cycle: identify the worst two or three slots, replace them with a variant of something already selling well, and re-measure in another six weeks. Repeat. This one habit separates operators whose machines improve from operators whose machines drift.
Doing this on paper works for one machine and collapses at four. Tracking stock and vend rates per slot is exactly what the fleet manager is for — it turns the shopping list and the cut list into outputs rather than chores.
Seasonality and Dietary Demand
Two adjustments worth making deliberately rather than by accident.
Seasonal. Cold-drink demand climbs in summer and falls in winter; hot beverage and heavier snacks move the other way. In hot months, widen water and sports drink facings — often the single easiest revenue increase available, because you're just reallocating slots you already have. In cold months, shift toward coffee and more substantial snacks.
In hot climates, treat summer water capacity as a planning problem rather than a restocking one. Running out of water in July at a warehouse is lost revenue you cannot recover on the next visit.
Dietary. Demand for sugar-free, gluten-free, and higher-protein options is real and no longer niche, but it varies hugely by site. The mistake in both directions is symmetrical: ignoring it entirely at an office or gym leaves money on the table, and building a whole machine around it at a truck stop empties your slots of things people actually buy.
The reliable approach is to hold one or two slots as your rotating test space, try a new item there each cycle, and promote anything that clears your vends-per-week threshold into a permanent slot. Over a year that quietly tunes each machine to its own location — which is something no bestseller list can do for you.