A torch used for backpacking and camping will be compact as it will be carried on the person or in a backpack at all times. It will also need to be lightweight as backpackers have enough equipment to carry around without having to worry about a large and heavy D-cell flashlight weighing on their shoulders.
A long runtime is also an advantage as when travelling for long periods in remote areas repleneshing spent batteries can be difficult, therefore small LED models are especially suited to this task.
Rechargeable devices are not recommended for backpacking or camping, unless you are camping with a vehicle and have the ongoing ability to recharge the unit. Even so, in the event of a vehicle breakdown you could still be left without a torch so a 123A Lithium powered model is always the preferred option.
The torches recommended for Backpacking and Camping use are listed after this Buyers Guide article or you can click the following links for in-depth information about each of the torch models -