I'd be leary of it unless you use an air displacement technique like a squirt of butane or nitrogen as you cap the bottles. I have a partial 5L kit sitting in my darkroom now in which one of the developer chemicals turned belly up after I opened the bottle, and the bottles for these are quite small to start with. The rest of the kit is very tolerant of air, the bleach even needing air to regenerate itself. If you will be using the remainder in several months I'd mix the color chems and seal it in glass bottles without air and use it soon. I personally don't trust plastic for that job.