Built forCS-CartAdd-ons for CS-Cart & Multi-Vendor, from an independent developer

Build-a-Box Bundles

by Kavio Labs · for CS-Cart & Multi-Vendor

Customers fill their own box from your products and pay one box price: any 3 for a fixed price, 6 with 10% off, gift message included.

Tested on 2 builds Updated Nov 4, 2026 Version 1.0.0 CS-Cart, Multi-Vendor 4.17.2 – 4.21.x No core file edits
Built forCS-Cart

What it does

For stores that sell gift boxes, snack and tea boxes, beauty sets, sock packs, movie or book bundles. The core Product bundles add-on sells a fixed set; here the customer chooses the contents. You pick a product as the box page, add sizes and their prices, point the box at categories or products, and the builder appears under the product block. Works on CS-Cart and Multi-Vendor, where vendors build boxes from their own products.

How it works

The shopper picks a size, adds products with Add and +/- buttons and watches the tray fill slot by slot with the regular total, the box price and the saving. The button unlocks when the box is full. In the cart each item shows its slot, the box line shows the gift message and an Edit box link. Changing the quantity of one line changes the whole box, removing one line removes the box. The server checks every box again before it enters the cart.

Features

  • Box builder under the product block of any product you choose
  • Box sizes with a fixed box price, a percent off the items or regular prices
  • Products from categories and subcategories, hand-picked products and exclusions
  • Category tabs, search, product cards with Add and +/- counters
  • Box tray with slots, progress, regular total, box price and saving
  • Repeat rules, maximum per product, stock-aware box quantities
  • Optional gift message in the cart, order pages and admin order
  • Exact cents per item line, so taxes, stock and payouts stay correct
  • Edit box from the cart, whole-box quantity and removal
  • Box report with top products, by box and by size
  • Vendor boxes on Multi-Vendor, storefront boxes on CS-Cart Ultimate
  • Full page cache safe on 4.21, works with responsive-based themes

What you get

Packagekv_build_a_box-1.0.0.zip, installed through Add-ons → Manage add-ons
Updates & support12 months included. Download new versions from your account and install them in Add-ons → Manage add-ons or the Upgrade Center.
License1 production installation. Staging, dev and localhost are free and unlimited. The add-on keeps working after the update period ends. How licensing works
Version
1.0.0
Updated
Nov 4, 2026
CS-Cart
4.17.2 – 4.21.x
Tested on
CS-Cart 4.17.2, Multi-Vendor 4.17.2
PHP
7.4 – 8.3
Core edits
None
Add-on ID
kv_build_a_box
Developer
Kavio Labs Software Limited

Support

Policy
Bug reports
1 business day
How-to questions
2 business days
Channel
Tickets in your account

Frequently bought together

Add a released add-on to this order and save 15% on it. It uses the same edition and store domain.

Build-a-Box BundlesThis add-on
Frequently Bought Together & Cross-sellShow what customers really buy together, with the combined price and one Add all to cart button.
$69
Advanced Promotions: Buy X Get Y, Tiers, SchedulesBuy X get Y, cheapest or N-th item free, tier tables and happy hours inside the CS-Cart promotion editor.
$99
Gift Wrap & Gift MessagesGift wrap with prices, a personal gift message and a gift receipt without prices, chosen at checkout.
$49

Buy with confidence

What stands behind your license

  • Tested builds

    This product was tested on these builds. Builds we did not test are not listed.

    • CS-Cart4.17.2
    • Multi-Vendor4.17.2
  • 12 months of updates

    Updates and support are included in the price. The product keeps working afterwards; renewing is optional.

    How licensing works
  • 30-day refund

    If it is not what you expected, tell us within 30 days and we refund the order.

    Refund policy
  • Secure checkout

    Pay by card, Apple Pay or Google Pay on Stripe's secure page. Your card number never reaches our server.

    Ask a pre-sales question

Sold by Kavio Labs Software Limited, registered in England and Wales No. 17532441. About us

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See the roadmap

Everything we are building next for CS-Cart and Multi-Vendor, with planned prices. Leave your email on any add-on and we write once when it ships.

Build-a-Box BundlesCS-Cart add-on · v1.0.0
12 months of updates & support$59one-time
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