A side-loading box is a corrugated shipping box that opens along a side panel, so you can slide items in and out with less bending or folding. It’s especially handy for long or flat pieces that don’t fit well in standard top-loading cartons.

• Great for: framed art, posters, mirrors, keyboards, and even guitar-shaped boxes listed on this page.
• Sizes: Offered in compact to extra-long dimensions to match different items.
• Strength: You’ll see ECT ratings (like 32 or 44) in titles, indicating board strength.
• Use cases: Helpful for shipping, moving, mailing, and storage where easy side access is preferred.

Start with the item’s length, width, and thickness, then choose a side-loading box that accommodates those dimensions plus room for padding.

1. Measure carefully: Note the longest side, the shorter side, and depth (including any frame hardware).
2. Add clearance: Leaving a small buffer for bubble wrap or edge protectors can help reduce pressure on corners.
3. Match orientation: Pick a box whose side-opening and shape align with your piece.
4. Consider strength: If the frame is heavy or will be stacked, look for higher ECT ratings shown in the product titles.
5. Test fit: A quick dry run with your padding can help verify the choice before sealing.

You’ll find both single boxes and multipack bundles on this page, so you can buy exactly what you need.

• Single boxes: Useful for one-off shipments, specialty sizes, or trying out a fit before buying more.
• Bundles: Available in a variety of counts (for example, 5-, 10-, 15-, or 25-packs depending on the size and style). These can be practical for moves or small-business shipping.
• Mix and match: Many dimensions are offered across singles and bundles, making it easier to stock up on the sizes you use most.
• Tip: Check the product title for the count and dimensions to plan your order.

ECT numbers in the product titles indicate the corrugated board’s strength rating. While exact performance depends on many factors, a higher ECT generally points to stronger board that can better handle weight and stacking.

• ECT-32: Common for everyday packing and shipping needs where loads are moderate.
• ECT-44: A higher-strength option that may be preferred for heavier contents or when cartons are stacked.
• Choosing: Consider content weight, how much padding you’ll use, and whether boxes will be stacked in transit or storage.
• Note: Results can vary by use; select based on your specific item and handling conditions.

In addition to standard kraft side loaders, the page includes compact white self-seal side-loading boxes. These are designed to close quickly without a separate taping step, which can speed up packing for smaller items.

• Form factor: Smaller, mailer-style dimensions suitable for compact products or literature.
• Closure: Self-seal design helps simplify packing; additional tape can still be used for extra reinforcement if needed.
• Finish: White exterior offers a clean look for shipping or gifting.
• When to use: Handy for quick fulfillment, organizing, or mailing lightweight items where convenience is a priority.