Clamshell and burger boxes need to do two things well: hold the item securely during transport, and vent enough steam to prevent a soggy bun. Here's how to pick the right size and format. Looking to stock up? Browse our related product range for bulk pricing and fast delivery.Regular ClamsSized for standard single-patty burgers or medium sandwiches. This is your default size for most core burger menu items.Extra Large ClamsBuilt for double or triple patty burgers, loaded sandwiches, or any item with significant height and bulk that a regular clam would crush or fail to close properly.Clamshell Boxes by DimensionBeyond burgers, clamshell boxes in various dimensions (6x6", 7x5", 9x6", 9x9") serve a wider range of fast-food items — from small snack portions to full combo-meal presentations with sides included in the same box.Why Ventilation Design MattersA well-designed clamshell allows steam to escape without letting the item cool too quickly — the balance point that keeps a burger bun from going soggy while the food is still hot when it reaches the customer. Related Reading Paper Bags Explained: Flat Handle vs Square Bottom vs D-Cut Disposable Cutlery Guide: Bio vs Wooden — What's the Difference? How to Calculate How Much Packaging Your Restaurant Needs Monthly Frequently Asked Questions Do clamshell boxes keep burgers warm? Yes, reasonably well for typical delivery timeframes — the enclosed design retains heat while still allowing enough ventilation to prevent excess sogginess. What size clamshell fits a double patty burger? An Extra Large clam is generally needed for double or triple patty burgers, since a regular-size clam may not close properly over the added height.