Lowe alpine tensor 23 backpack the tensor 23 is a brilliant all round daypack for hiking scrambling multi pitch climbing and even skiing this fully compressible 23 litre backpack has a handy external stretch mesh pocket that can be used to store anything from a wet waterproof to a map or guide book for lightweight hikers this could be used year round but for most of us it makes a great 3 season hiking pack the side compression straps can also be used to carry skis making this a multi s