Spartan Precision make the magnetic bipod system that has quietly become standard kit for hill stalking. The bipod attaches to a small adapter fitted to the fore-end and comes off with a pull, so you are not carrying a permanently mounted bipod through the heather and there is nothing to snag when the rifle goes on a shoulder.
The adapter is the part people get wrong. The bipod is useless without one, and there is more than a single fitting: the MagnaSwitch classic rifle adapter suits a standard sling stud, while the gunsmith adapter is for fitting into a stock that has no suitable mounting point. Check what your fore-end actually has before you order, and remember a second adapter on a second rifle is cheaper than a second bipod.
Lite or Pro Hunt Tac. The Javelin Lite is the one to carry if weight is the deciding factor and most of your shooting is prone or off a rest. The Pro Hunt Tac is stiffer and available in a long leg version, which is what you want if you sit or kneel behind it. The FHF Aspis holster keeps it on a belt rather than rattling in a pack.
Related: front mount bipods · shooting sticks · rifle rests · rifle slings