The mailer for a single LP is a 13 by 13 inch pad-and-flap carton with stiffener boards; a crate of twenty-five sits in a 14 by 14 by 5 inch double-wall carton. Both stay inside the USPS Media Mail size and weight ceilings and both need the record to be immobile. Anything that flexes ships the pressure straight into the platter, and a warped LP is not fixable.
A record that cannot slide inside the box does not care how much bubble wrap is around it.
Records break when the box bends and the album resists. So the carton has to be stiff enough to keep its shape and small enough that the record cannot move inside it. The four setups below cover every common case.
| What is inside | Box size | Packed weight | Type |
|---|---|---|---|
| One 12-inch LP | 13 × 13 × 1 in | 1.5 to 2 lb | Purpose-built LP mailer with fold-in flaps and two 12.5 in stiffener boards |
| Two to five LPs | 13 × 13 × 2 in | 3 to 6 lb | Fold-and-tuck LP mailer, same board pattern, deeper |
| A stack of about 25 LPs | 14 × 14 × 5 in | 15 to 20 lb | Double-wall LP carton, records sleeved and stacked upright |
| Seven-inch 45s (up to 20) | 7.5 × 7.5 × 1 to 2 in | 1 to 3 lb | 45 rpm mailer with an insert that centers the record on the label |
Everything in the table sits comfortably inside USPS Media Mail's 70 pound weight limit and 108 inch length-plus-girth combined limit, per usps.com's Media Mail service page read on 2026-08-11. So the routing is up to price, not eligibility.
Two 12.5 inch pieces of corrugated, one against each face of the sleeved LP. That is the layer that stops a seam split when the mailer bends across a sortation belt. A single board on one side moves the flex to the other and does nothing.
The album goes in with the sleeve opening facing up, so a shock cannot walk the record out of the jacket. The corners of the jacket ride on the corrugate rather than on empty air.
The right box is the smallest one the record fits into. Loose stacks pick up momentum inside the carton, and every millimeter of slack becomes a corner ding on the jacket. Bubble wrap around a loose record ships the record; it does not steady it.
Standard 180 gram pressings run around 1.5 mm thick jacket to jacket, so a five inch depth clears the stack of twenty-five with room for the pads without letting the whole column shift.
Uline, ULINE Vinyl Record Mailers, Bags Unlimited, Sleeve City and Egghead Records all sell the fold-and-tuck LP mailers as a first-order stock item, typically in packs of 10, 25 and 50. Double-wall 14 by 14 by 5 cartons are stocked by the same suppliers under names like “record box” or “25 LP shipper.” The 7.5 inch 45 rpm mailer is a specialty item and is easier to find at Sleeve City or Bags Unlimited than at a general packaging supplier.
A local option: many USPS retail counters do not stock a record-shaped Priority Mail box, so the shipper's own carton is the right route. Media Mail is a service, not a Postal Service box product, so any carton meeting the size limits qualifies.
The shipping calculator reads the box dimensions and packed weight, then returns the live rate for the lane. Media Mail is a Postal Service product, so those quotes come back on Ground Advantage and the other parcel services; whether Media Mail is cheaper depends on the ZIP-to-ZIP zone. Cost-per-record on a stack of twenty-five is typically lower than the same records sent as five 5-LP mailers, because carriers price the second package's minimum charge before they price the extra weight.
Every carrier revises limits without notice. Treat the figures above as what the Postal Service published on the date shown.
A 13 by 13 inch mailer roughly 1 inch deep, sized to the album with almost nothing to spare. That is a purpose-built LP mailer, not a repurposed box. The record cannot slide, and the corrugate stops the jacket from flexing on impact.
About 14 by 14 by 5 inches works for a snug stack of 25 standard 180 gram jackets. Overpack a fold-and-tuck LP carton if the stack is loose. A weight of 15 to 20 pounds is normal, and it stays comfortably inside the USPS Media Mail 70 pound ceiling.
Yes for single LPs. Two 12.5 inch corrugated pads, one on each side of the sleeved album, are what stop a seam split when the mailer bends. Mailers marketed as record boxes usually include them; a plain white 13 inch carton does not.
A 7.5 by 7.5 inch mailer with a 45 rpm insert protector is the shape that fits. A 12 inch LP mailer around a 45 is a return-to-sender waiting to happen — the record slides, the label creases, and the postage was wrong anyway.
Not safely. A shoe box has no side stiffness, and vinyl warps when the box flexes against the platter. Use a mailer designed for records, or wrap two thicknesses of corrugate around the stack and put it inside a snug outer carton.