The fact that this plunge cut saw is cordless makes it very easy to bring with you. The voltage amounts to 54 volts and isn't all too heavy at 4.7 kg.
From ManoMano
DCS520NT 54v xr flexvolt Cordless Plunge Saw Bare Tool + tstak Case - Dewalt
ITS
Dewalt DCS520NT 54V XR FLEXVOLT Brushless Plunge Saw - Body with Case
This product is also available at 5 unverified stores.