What Are Side Loading Boxes?Side loading boxes (also called side load cartons or end-opening boxes) are specialized shipping containers designed for flat, fragile items like mirrors, picture frames, artwork, and glass. Unlike traditional top-opening boxes, these cartons feature openings on the narrow ends, allowing you to slide products in horizontally - eliminating the risk of dropping or bending during packing. Full Overlap Flap (FOL) ConstructionOur side loading boxes use FOL (Full Overlap Flap) design, meaning the flaps overlap completely when closed. This creates a double layer of protection on the top and bottom, making them significantly stronger than standard RSC (Regular Slotted Container) boxes. The extra reinforcement prevents crushing during stacking and transit. Common Uses for Side Load Boxes- Picture frames - from small 8x10 prints to large canvas frames
- Mirrors - bathroom mirrors, decorative mirrors, wall mirrors
- Artwork - paintings, prints, posters, photography
- Glass sheets - window panes, cabinet glass, custom cuts
- Signs - metal signs, acrylic signs, yard signs
- Awards & plaques - trophies, certificates in frames
- Flat electronics - tablets, monitors (with proper padding)
How to Choose the Right SizeMeasure your product at its longest, widest, and thickest points. Add 1-2 inches to each dimension for padding material (bubble wrap, foam, etc.). Side loading boxes are sized by inside dimensions: Length x Width x Depth. Pro tip: For fragile items like mirrors, use corner protectors and fill all empty space with packing material to prevent shifting during transit. Why Buy Side Loading Boxes from Prism Pak?We stock multiple sizes of side loading boxes ready to ship same-day from our warehouse. As a wholesale packaging supplier since 1986, we offer: - Bundle pricing - lower cost per box when you buy in quantity
- Fast fulfillment - most orders ship within 24 hours
- FDA-compliant materials - safe for all products
- Custom options available - need a special size? Contact us for quotes
Side Loading Boxes: Frequently Asked QuestionsWhat is a side loading box?A side loading box is an end-opening corrugated shipping carton built for flat, fragile items such as mirrors, picture frames, artwork, and glass. Instead of packing from the top, you slide the product in horizontally through the narrow end, which avoids bending or dropping it during packing. They are also sold as side load cartons or end-opening boxes. What size side loading box do I need for a mirror or picture frame?Measure the frame or mirror at its longest, widest, and thickest points, then add 1-2 inches to each dimension for padding. Side loading boxes are listed by inside dimensions as Length x Width x Depth, so a 24 x 18 x 2 framed mirror generally needs a box around 26 x 20 x 4 once bubble wrap and corner protectors are included. How much weight can a side loading box hold?Our FOL side loading boxes typically support 40-65 lbs depending on the size. The full overlap flap construction doubles the board on the top and bottom, which is what gives these cartons a higher stacking strength than a standard RSC box. Check the individual product listing for the exact weight limit on the size you need. What is the difference between a side loading box and a telescope box?A side loading box is one piece with an opening on the narrow end, while a telescope box uses a separate lid and base that slide over one another. Side loading boxes cost less and pack faster; telescope boxes adjust to the height of the product and are the better choice when you need reusable or depth-adjustable packaging. Can I use side loading boxes for international shipping?Yes. These kraft cartons are accepted by USPS, UPS, FedEx, and international carriers. Use reinforced packing tape on all seams, and fill any void space with padding so the contents cannot shift over a longer transit route. Do you offer custom printing or custom sizes on side loading boxes?Yes, custom printing and custom sizes are available on bulk orders of side loading boxes. Call Prism Pak at 570-709-0366 or email [email protected] for minimum quantities, lead times, and pricing. Order Side Loading Boxes TodayBrowse our selection above to find the right size for your shipping needs. Questions about sizing, bulk pricing, or custom options? Call us at 570-709-0366 or email [email protected] - we're here to help you ship safely and affordably.
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