- Description Trespass Stainless Steel Flask 750ml Whether you fancy a warm cuppa tea or a cold refreshing apple juice on the mountain tops, the Thirst 75 has you covered. The stainless steel flask holds up to 750ml so you’re sorted for the whole day or camping trip. Easy use, push/pull stopper. Wide mouth top. Heat insulating 750ml Flask. Unbreakable and lightweight with easy use, push/pull stopper. Keeps drinks hot and cold. Size: 750ml