You’re Shipping 10,000 Boxes a Month. Are They the Right Size?

Here’s a number that should make you uncomfortable:

An example: if a box one size too big costs you $2.50 more to ship, then at 10,000 boxes a month that’s $25,000/month in unnecessary shipping costs. $300,000 per year. Gone.

And that’s before we talk about the extra void fill, the damaged products, and the customers posting unboxing videos of your tiny product swimming in a giant box.

The Subscription Box Packaging Problem

Your business is fundamentally different from traditional e-commerce:

Traditional E-commerce	Subscription Boxes
Customer picks products	You curate products
Same SKU = same box	Every box is different
Predictable packaging	Variable contents monthly
One-time optimization	Continuous optimization

Most order management systems assume predictable orders. “Customer orders Widget-A, ship in Box-Small.” Done.

But your March box has 6 items. Your April box has 4 different items. Your premium tier has 8 items. Your “snack lovers” variant has bulky items. Your “beauty” variant has fragile items.

Every. Single. Box. Is. Different.

How Most Companies “Solve” This

Option 1: One Box Size for Everything

Pick a box that fits your largest possible combination. Ship everything in it.

Result: Small orders ship in a box built for your biggest combination. You’re paying dimensional weight on air.

Option 2: Manual Box Selection

Train packers to eyeball each order and pick a box.

Result: Inconsistent. Slow. Doesn’t scale. New hires get it wrong for weeks.

Option 3: Simple Rules

“If order has 4+ items, use large box.”

Result: Better than nothing, but often wrong. A box with 4 small items doesn’t need the same box as 4 large items.

The Right Solution: 3D Bin Packing

StoaPack is our 3D bin packing engine. It solves the actual math problem:

“Given these specific items with these specific dimensions, what is the smallest box that fits them all?”

This isn’t a lookup table. It’s not a rule engine. It’s actual 3D spatial optimization, and it returns a plan quickly.

How It Works

1. You enter product dimensions once — Length, width, height for each SKU
2. You define your box inventory — What boxes do you have available?
3. StoaPack calculates — For each order, which box fits best?
4. Packer sees the answer — “Use Box M”

What It Handles

StoaPack’s API supports real packing constraints:

• Orientation — Keep items upright
• Weight limits — Every box has a maximum weight
• Box stock — Only boxes you have on hand are used
• Custom instructions — Keep named items apart, assign an item to a box type, or cap how full a box gets. Instructions are processed by an AI provider (Google Gemini or OpenAI), and one StoaPack can’t apply fails the request
• Hazmat — Each dangerous-goods item type is packed in its own box, away from other items

StoaPack doesn’t model fragility, padding or load-bearing strength. Inside Vectis today, packing uses your product and box dimensions, weights, nesting settings and hazmat classifications; orientation and custom instructions are available through the standalone StoaPack API.

Real Math, Real Savings

Let’s do the calculation for a typical subscription box company:

Metric	Before StoaPack	After StoaPack
Orders/month	10,000	10,000
Avg. box size	12x10x8	10x8x6
Avg. DIM weight	6.9 lbs	3.5 lbs
Avg. shipping cost	$9.20	$7.10
Monthly shipping	$92,000	$71,000
Annual savings	—	$252,000

Example calculation based on typical dimensional weight pricing. Your actual savings depend on your product mix, box inventory, and carrier contracts.

Built Into Your Workflow

StoaPack integrates directly with Vectis. Your packer sees the recommended box for each package, with alternatives:

Order #12847 - Sarah M.
━━━━━━━━━━━━━━━━━━━━━━━━
Items:
  • Artisan Chocolate Bar (2)
  • Gourmet Coffee 12oz
  • Ceramic Mug
  • Recipe Card Pack

📦 Use: BRANDED-MED (10x8x6)

No guessing. No “which box should I use?” No experienced packer required.

Works With Your Subscription Platform

Vectis + StoaPack handle fulfillment for subscription businesses:

Order Processing

• Import orders from your subscription platform by CSV, or through the API (API-client tokens are read-only on orders, products, and inventory today, so contact us before you build an API import)
• StoaPack calculates optimal packaging for each order
• Print shipping labels
• Pick from the on-screen pick queue; packages are released to it in batches

Flexible Product Mixes

• Optimize packaging for any product combination
• Handle varying box contents month to month
• Same packing optimization regardless of what’s in the box

See Your Savings

We’ll calculate your potential savings using your actual:

• Product dimensions
• Box inventory
• Monthly volume
• Current shipping costs

Bring your data. We’ll show you the math.

Schedule a demo →

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Common Questions

Do I need to measure every product?

Yes, accurate dimensions are required. But you do it once per SKU. We provide measurement guidelines and can help with bulk measurement workflows for large catalogs.

What if my boxes are custom branded?

Perfect. Enter your custom box dimensions (internal dimensions, not external). StoaPack optimizes for your actual packaging inventory, branded or not.

Can I use StoaPack without Vectis?

Yes. StoaPack is available as a standalone API. Integrate it with any system. But the Vectis integration makes the workflow seamless—no development required.

How accurate is the box selection?

Very. StoaPack uses real 3D bin packing (not simple volume math): it places each item by its dimensions inside your actual boxes, within each box’s weight limit. It finds a good plan quickly but doesn’t guarantee the best possible one, so accurate product dimensions matter most.

What if StoaPack picks a box I’m out of?

You can set box availability in real-time. If you’re out of Medium boxes, StoaPack will use the next best option from your available inventory.