The Pyrex Hot/Cold Unipack was designed for the Portables line of Pyrex products where either heat or cold is required. This pack can be either microwaved or frozen. There are many other applications of this product such as for use in lunch boxes or bags. Since they are flexible they will fit many needs.

Included: (4) Pyrex Large Hot/Cold packs. Compatible with Pyrex Portables carrier (sold separately). Designed to either heat up or freeze for multipurpose uses. Genuine Pyrex Hot/Cold Packs.

Date First Available: May 12, 2016. Is Discontinued By Manufacturer: No. Best Sellers Rank: #82,325 in Health & Household. Customer Reviews: 4.6 out of 5 stars 102 ratings 4.6 out of 5 stars. Item model number: PP-HKMC93. : B01FKLCJES. Item Weight: 5.9 pounds. Product Dimensions: 11 x 7.5 x 2 inches.