The Dr Gym Thermal Bag in a single-bottle size is typically designed as a compact, vertical carrier. It is popular for carrying either large fitness jugs or baby bottles while maintaining their temperature. 
 
Key Highlights for Bottle-Sized Bags
Capacity Options:
Baby Bottle Size: Compact bags designed for standard or wide-neck baby bottles.
Large Fitness Size: Larger sleeves designed for 2.2L (half-gallon) or 3.2L (full-gallon) water jugs.
Thermal Retention: Uses insulated neoprene or Oxford fabric with a thermal lining to keep liquids cold for 6 to 12 hours.
Convenience Features:
Storage Pockets: Often includes external compartments for a phone, keys, or cards.
Portability: Features an adjustable shoulder strap and a side handle for easy carrying.
Material: Usually made from 4mm thick BPA-free neoprene or water-resistant Oxford cloth. 
 
Maintenance Tips
Cleaning: Use a damp cloth with mild soap for the interior; avoid machine washing or submerging in water to preserve the insulation's integrity.
Storage: Store the bag empty with the zipper open to prevent moisture buildup and odours. 
 
Key Highlights:
Designed to fit most standard 2.2L (half-gallon) or 3.2L (one-gallon) water bottles.
Designed to keep food hot for up to 8 hours or cold for up to 12 hours
Utilises a four-layer system including a 300D/900D waterproof Oxford outer fabric, high-density pearl cotton insulation, and a leak-proof lining
Features heat-welded seams and a seamless inner liner (often PEVA or aluminium) to prevent spills from soaking through
Value for money