Pack light with a small, technical tent that you can carry on your back, like one from the Encounter range. Tent size depends on how many people are going, but go for as compact as possible.
Choose a lightweight and compact sleeping bag that is warm enough for the season you’re going in. Extra blankets can double as picnic rugs.
Go for multi-tasking, lightweight and compact furniture, like a folding stool that doubles as a table and seat.
With no electricity, you’ll need to make your own fire to cook on, or take a small gas cylinder stove. A torch is essential.