I have a cheap steel flat top rack on the front, that carries a cheap rack top bag of at least 6 lt, as well. I use it instead of an Handle bar bag, for cost and space for my cables.. I got the bag for $7.00au from Ebay China., I also carry 2 chalk bags as feed bags attached at the top of the steering tube, plus a top tube bag. These 4 bags hold my maps, phone, batteries, some spares, snacks for dog, a small towel, a rain resistant pocho, snacks for me in the feed bags, mossie and fly protection, and a fly net. Their is still space left over, but these bags save me going into my panniers during the days ride. And add virtually no weight at all.