USPS Store
store.usps.com › postal store › shipping supplies › priority mail flat rate® medium box
Priority Mail Flat Rate® Medium Box | USPS.com
The Priority Mail Flat Rate® Medium Box features predetermined rates regardless of weight (domestically) or destination, similar to the Flat Rate Envelope.
USPS
usps.com › ship › priority-mail.htm
Priority Mail | USPS
Use our Priority Mail Flat Rate Envelopes or Boxes that come in standard sizes so you don't have to worry about measuring them.
USPS Priority Mail Medium Flat Rate Box is $16.65
I use Pirateship to ship games being sold/traded. USPS Ground is a boon if you have a box. USPS Priority Mail is cheaper than getting the label direct from USPS. More on reddit.com
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January 20, 2025USPS Medium Box 11 x 8.5 x 5.5 Equivalent Sized Side Loading Box Option?
I'd advise you to not insert the flat rate boxes into a poly for shipping. The boxes are free to use for flat rate postage and to abuse their intended purpose is one thing, but it would also suck if your package was randomly inspected and charged for the flat rate instead. Sure, you will get anecdotes from people that abuse the system saying they never get caught, but all it takes is one time for a bad day with your customer. More on reddit.com
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February 26, 2025ebay says my USPS box is the dimensions of a medium flat rate box but my box says large?
You go by what's actually on the box, since you can bet your ass that's how they will verify it.
More on reddit.com 5
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March 2, 2024USPS worker said I can’t use flat rate priority mail boxes with size labeled on them?
Nah, you just got someone that didn’t know any better. If it happens again, Poshmark’s contract with USPS actually has a special clause on the labels themselves you can point out. The bottom will read: Poshmark shippers are authorized to use all Priority Mail packaging, including Flat Rate and Regional Rate packaging through zones of local and 1 thru 8. More on reddit.com
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December 1, 2023Videos
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Western Oregon University
wou.edu › mail › home › domestic-mail › united-states-postal-service-usps › usps-priority-mail › usps-priority-flat-rate
USPS Priority Flat Rate – University Mail Services
Home » Home » Domestic Mail » United States Postal Service - USPS » USPS Priority Mail » USPS Priority Flat Rate Menu
GoShippo
goshippo.com › blog › usps-flat-rate-box-sizes-prices-how-it-works
USPS Flat Rate Boxes: Complete Size & Pricing Guide
In this complete guide, we'll cover everything you need to know about USPS flat rate boxes prices and sizes, Priority Mail shipping options, and when to choose flat rate versus other USPS services.
Stamps.com
store.stamps.com › products › priority-mail-medium-flat-rate-box
Priority Mail Medium Flat Rate Boxes, 25/pack – Stamps.com Supplies Store
USPS SKUs: Priority Mail Medium Flat Rate Box (11 1/4" x 8 3/4" x 6"): O-FRB1 Priority Mail Medium Flat Rate Box (12" x 3 1/2" x 14"): O-FRB2 Maximum Order: 20 bundles of 25 Quantity/Pack: 25 Call 1-800-610-8734 fo
USPS Store
store.usps.com › store › results › shipping-supplies-boxes › _ › N-u9qwm0
Boxes | USPS.com
Priority Mail Flat Rate® Small Box · Single, Pack of 10 or 25 · 8-11/16"(L) x 5-7/16"(W) x 1-3/4"(H) $0.00 · Priority Mail Flat Rate® Medium Box · Single, Pack of 10 or 25 · 11-1/4"(L) x 8-3/4"(W) x 6"(H) $0.00 · Priority Mail Flat Rate® Side-Loading Medium Box ·
Pirate Ship
support.pirateship.com › en › articles › 1831802-why-you-shouldn-t-use-medium-or-large-flat-rate-boxes
Why you shouldn't use Medium or Large Flat Rate Boxes | Pirate Ship Support
As alternatives to the Priority Mail Medium Flat Rate Box, you can use your own custom-sized box or other Priority Mail packaging that qualifies for cubic rates. We've listed those below. USPS mailing boxes: USPS offers two free "mailing boxes" in the cubic 0.4 size:
USPS Store
store.usps.com › postal store › shipping supplies › priority mail® forever prepaid flat rate side-loading medium box
Priority Mail® Forever Prepaid Flat Rate Side-Loading Medium Box | USPS.com
Priority Mail® Forever Prepaid Flat Rate Side-Loading Medium Box
Includes Customers Return Address
Price $21.95
EasyPost
easypost.com › home › usps flat rate boxes, envelopes, & pricing
USPS Flat Rate Boxes, Envelopes, & Pricing - EasyPost
August 10, 2025 - Small USPS Priority Mail Flat Rate Boxes are great for items that are small, but dense or rigid like larger pieces of clothing, brochures, and small electronics. Outside: 8 11⁄16” x 5 7⁄16” x 1 ¾” Inside: 8 5⁄8” x 5 3⁄8” x 1 5⁄8” · Medium Priority Mail Flat Rate Boxes ...
USPS Store
store.usps.com › postal store › shipping supplies › priority mail flat rate® side-loading medium box
Priority Mail Flat Rate® Side-Loading Medium Box | USPS.com
The Priority Mail Flat Rate® Side-Loading Medium Box is a quick, easy, and convenient way for you to ship Priority Mail packages.
Reddit
reddit.com › r/hexandcounter › usps priority mail medium flat rate box is $16.65
r/hexandcounter on Reddit: USPS Priority Mail Medium Flat Rate Box is $16.65
January 20, 2025 -
New USPS rates went into effect on 19 January, the commercial rate (what you can get using PirateShip, etc...) for USPS Priority Mail Medium Flat Rate Box is $16.65.
At least for the USPS Priority Mail Medium Flat Rate Box this does not look like a rate increase from last year.
USPS Store
store.usps.com › store › results › free-shipping-supplies › shipping-supplies › _ › N-alnx4jZ7d0v8v
Shipping Supplies | Free Shipping Supplies | USPS.com
Priority Mail Flat Rate® Small Box · Single, Pack of 10 or 25 · 8-11/16"(L) x 5-7/16"(W) x 1-3/4"(H) $0.00 · Priority Mail Flat Rate® Medium Box · Single, Pack of 10 or 25 · 11-1/4"(L) x 8-3/4"(W) x 6"(H) $0.00 · Priority Mail Flat Rate® Side-Loading Medium Box ·
USPS Store
store.usps.com › postal store › shipping supplies › priority mail® forever prepaid flat rate medium box
Priority Mail® Forever Prepaid Flat Rate Medium Box | USPS.com
Priority Mail® Forever Prepaid Flat Rate Medium Box
Includes Customers Return Address
Price $21.95
USPS
usps.com › ship › mail-shipping-services.htm
Mail & Shipping Services | USPS
1-3 day delivery is available to most U.S. addresses and PO Box™1 addresses with a money-back guarantee2. With our free Flat Rate Envelopes, you don't need to weigh shipments 70 lbs and under.
Reddit
reddit.com › r/flipping › usps medium box 11 x 8.5 x 5.5 equivalent sized side loading box option?
r/Flipping on Reddit: USPS Medium Box 11 x 8.5 x 5.5 Equivalent Sized Side Loading Box Option?
February 26, 2025 -
I often reuse boxes whenever possible but the medium flat rate box from USPS is a nice size for some things I sell. Any options out there that are identical but not branded? I was thinking I could just use the USPS box and put in a giant poly bag if I can find the right size...11 x 8.5 x 5.5. My search finds some side loaded options but there are half the height...
Any known sources please let me know. Thanks!
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I'd advise you to not insert the flat rate boxes into a poly for shipping. The boxes are free to use for flat rate postage and to abuse their intended purpose is one thing, but it would also suck if your package was randomly inspected and charged for the flat rate instead. Sure, you will get anecdotes from people that abuse the system saying they never get caught, but all it takes is one time for a bad day with your customer.
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Walmart carries an 11.5x7.5x5.5 for roughly 83 cents
USPS Store
store.usps.com › store › results › priority-mail › shipping-supplies-boxes › _ › N-p52cprZu9qwm0
Boxes | Priority Mail | USPS.com
Priority Mail Flat Rate® Small Box · Single, Pack of 10 or 25 · 8-11/16"(L) x 5-7/16"(W) x 1-3/4"(H) $0.00 · Priority Mail Flat Rate® Medium Box · Single, Pack of 10 or 25 · 11-1/4"(L) x 8-3/4"(W) x 6"(H) $0.00 · Priority Mail Flat Rate® Side-Loading Medium Box ·
USPS
pe.usps.com › text › dmm300 › notice123.htm
Notice 123 | Postal Explorer
Small Flat Rate Box: $11.30 · Medium Flat Rate Box: $19.20 · Large Flat Rate Box: $28.35 · APO/FPO/DPO Large Flat Rate Box: $27.10 · Parcels that exceed one cubic foot (1,728 cubic inches) are charged based on the actual weight or the dimensional weight, whichever is greater (see DMM 223.1.4).
Easyship
easyship.com › blog › comparing-usps-medium-large-flat-rate-boxes
Cons of USPS Medium & Large Flat Rate Boxes | Easyship
July 29, 2025 - The packaging itself is provided for free and be can be picked up at the post office or ordered from USPS online. ... USPS Medium Flat Rate Box (side-loading): max weight: up to 70 lbs / dim: 14.125” x 12” x 3.5”
ShipStation
shipstation.com › home › usps flat rate boxes, envelopes, and prices
USPS Flat Rate Boxes, Envelopes, and Prices
2 weeks ago - If you try to use a Flat Rate box ... one-size-fits-all packaging that lets you fit as much as you can into the box as long as it’s under 70 lbs....
GoShippo
goshippo.com › blog › usps-priority-mail-vs-usps-flat-rate
USPS Priority Mail vs Flat Rate: Costs, Box Sizes & Which is Cheaper 2025
Priority mail flat rate medium box options include two sizes with the same medium flat rate box price: $17.60 retail / $15.25 commercial. Flat rate medium box cost becomes worthwhile when: ... The priority mail large box cost of $24.75 retail ...