1. Scan Capacity
Engine analyzes SKU dimensions against the active shipment box.
v4.0 Shipping Engine
More items. Same shipping.
For frozen and refrigerated orders, shipping is expensive. Fits In The Box shows what customers can still add without moving to the next shipping tier.
Green Valley Market
Actual storefront widget
Implementation
The Spatial Workflow
2. Display Suggestions
Show add-ons that still fit and keep shipping unchanged.
3. Confirm Fit
Update cart messaging in real time as customers top up orders.
Fill the boxat checkout
Show only add-ons that fit the active shipment so customers can top up without shipping surprises.
Revenue Audit
Live Checkout Logic
Shipping TierProtected
Capacity OptimizationActive
Cart MessagingReal Time
Upsell Intelligence
Fits! Selection
Fits!0.2 ft³Golden Meadow Raw Honey
Honey & Spreads
Fits!0.1 ft³Stone Mill Almond Butter
Nut Butters
Fits!0.5 ft³Wanderer's Trail Mix
Crackers & Snacks
Start increasing your AOV today.
Built for the modern Shopify merchant
More items. Same shipping.
For frozen and refrigerated orders, shipping is expensive. Fits In The Box shows what customers can still add without moving to the next shipping tier.
storefrontGreen Valley Market
Live widget
at checkout
Operational checkout signalShipping-tier protection
Smart volumetric engine
Operational Logic
Calculate remaining shipping capacity
Real-time fitting logic runs on every cart update.
Recommend products that still fit
Only products that do not increase shipping are shown.
Update totals in real time
Messaging stays consistent as customers add products.
Fits In Your Box
Slide to browseGolden Meadow Raw Honey
Honey & Spreads
Stone Mill Almond Butter
Nut Butters
POPULARScale your margins, not your shipping.
Join merchants reducing high-cost frozen and refrigerated shipping by filling each box more efficiently.
Install on ShopifyDeep Dives
Start with the pages shoppers and operators actually need
Frozen & refrigerated shipping
See how packing-aware recommendations help cold-chain stores fill paid shipping capacity before checkout.
Explore the use caseDeveloper API
Use the packing engine in custom storefronts, middleware, warehouse workflows, or checkout logic.
Read the API docsShopify setup guide
Follow the install path for boxes, product dimensions, theme extension setup, and first widget launch.
Open the tutorial