The 10" x 24" Hydrocollator Steam Pack. Hydrocollator Steam Packs are very cost effective, they provide hundreds of treatments from each pack. Easy to use, just immerse in a Hydrocollator or Moist Heat Unit, then remove and wrap in a terry cover and toweling and apply to the treatment area. Each pack provides up to 30 minutes of deep, soothing, moist heat. 10" x 24".