Hollister leg bags maintain a low profile as they rest discreetly against the leg with soft, pleated sides. - Anti-Reflux Valve 550 mL Vinyl. Quality materials result in soft, comfortable, durable bags pleated sides increases the volume but not the length. Easy to open, closes securely even with limited dexterity. Protects skin from pressure points by placing leg strap connectors and drain valve away from direct contact with leg.