Reddit reviews SUPANT 4 x 5 litres/5.3 Gal Collapsible Water Jug Container, Freezable, BPA Free Plastic Water Carrier Tank, Outdoor Folding Water Bag for Sport Camping Riding Mountaineer, Food Grade
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SET INCLUDES: 4*5 Liter Collapsible Water Tank Carriers. Constructed to hold saltwater or fresh water or some other drinkings.FREEZABLE- It can be freezed with liquid. Besides, it can weaken sunlight burn inner liquid directly.FOOD-GRADE MATERIALS: Made of clear, non-toxic, food-grade safe plastic; Reusable, convenient, durable, space saving, and non-toxic.CONVENIENT: Features integrated handles for portability and large 1.4 inch bottle mouth for effortless filling and pouring. Screw-on cap provides leak-proof seal.SPACE SAVER: Portable water carriers are perfect for camping, hiking, travel, concerts and other outdoor activities. Simply air dry and fold flat to store away between uses.
This may or may not be feasible, but I'm picturing a set-up where you construct a portable lap pad out of a collapsible water bottle and a nice fabric covering. Then you could carry it around empty, and fill it up when you need it. Only limitation would be finding a water source. A 5L one like this would weigh just over 10 lbs when full.