Custom Boxes for Items That Don’t Fit Standard Sizes
Odd-shaped, oversized, or uniquely valuable? We build custom boxes and crates that fit your item perfectly.
Why customers choose this service
Clear benefits, protections, and options designed for your peace of mind and convenience.
Made to Measure
Custom boxes built to your item’s exact dimensions. No gaps, no shifting.
Heavy-Duty Materials
Double-wall corrugated, reinforced corners, and foam cushioning options.
Fast Turnaround
Most boxes built while you wait or within 24 hours.
The Standard Box Problem — When Your Item Doesn’t Fit
You have an item to ship. It’s too big, too oddly shaped, or too fragile for any standard box on the shelf. You try to make it work with extra padding, but it shifts around inside — and you know that means damage in transit.
This is the Standard Box Problem. Mass-produced boxes are made for average-sized items. If yours doesn’t fit, your shipping options are limited and risky.
A box that’s too big means your item slides around. A box that’s too small means crushing. Neither ends well.
Built to Fit — Custom Boxes, Made While You Wait
At Mailbox Plus, we build custom boxes to your item’s exact dimensions. Heavy-duty corrugated board, reinforced corners, and precision cuts — your item fits snugly with no shifting room.
Artwork, antiques, machinery parts, musical instruments, prototypes — if it doesn’t fit a standard box, we’ll build one that does. We can also add foam inserts, double-wall construction, and custom crating for maximum protection.
Most boxes built while you wait or within 24 hours. No ordering from a catalog. No guessing on dimensions.
From Measurement to Shipment — Fast
Bring Your Item
We measure your item and determine the ideal box dimensions, material thickness, and cushioning needs.
We Build Your Box
Custom-cut, reinforced, and assembled in-house — with foam, double-walls, or crating as needed.
Pack & Ship
Your item goes in, gets packed with protective materials, and ships out — all from our counter.
Fits Where Standard Boxes Fail
Odd Shapes Welcome
Sculptures, musical instruments, machinery, prototypes — we build boxes for items that don’t fit any standard size.
Heavy-Duty Protection
Double-wall corrugated, reinforced corners, and custom cushioning for fragile or heavy items.
Insurance Ready
Custom boxes built to carrier standards means your shipment qualifies for declared value coverage.
Online Design Tool
Design your own box layout at boxsize.cc and bring it in for professional assembly.
Perfect Fit, Perfect Shipment
A custom box means your item doesn’t move during transit. No shifting, no rattling, no crushing. Just a perfect fit.
Whether it’s a one-of-a-kind item or a regular shipment that needs special handling, we build the box that fits.
Bring your item to Mailbox Plus. We’ll measure, build, pack, and ship — all from one counter.
Frequently Asked Questions
Get quick answers to the most common questions about packaging, carriers, pricing, and what to expect.
Which carriers do you work with?
Will I receive tracking information?
Do you offer shipping insurance?
Can you ship internationally?
Do you handle customs paperwork?
Are there items you cannot ship?
Can you pack fragile items?
Do you make custom boxes?
How long will shipping take?
Can I drop off pre-labeled packages?
Do you offer pickup service?
Can you handle product returns?
How are shipping rates calculated?
Do you offer discounts for bulk shipping?
Can I receive packages at your store?
Is there a maximum size or weight limit?
Do shipping times change during holidays?
Do you offer full-service packing?
What if I’m shipping high-value items?
How do I check my shipment status?
Can you make boxes for large items?
Do custom boxes cost extra?
How long does it take to make a custom box?
Related Services You Might Need
Item Doesn't Fit a Standard Box?
We build custom boxes for odd-shaped, oversized, and fragile items. From $35/month for a private mailbox.
Get a Custom Box → →