I think it's better to ship all your items in one order to minimize the volume weight & handling fee. Yes, if you have more than 1 order, you can ask JAC to wait for them all & send it one time to Phil but then again you have to take the volume weight into consideration.
Right on Paul, but just to share as well - one time, I tried calling up jac in advance to consolidate my order but again, that's heavily dependent on the delivery times of the merchants you ordered from. I once ordered LP's from Amazon but of course it came from various merchants so even if I placed the orders at the same time @ Amazon, each merchant confirmed separately; thus different leadtimes and ETAs in JAC NY.
Bottomline is if it arrives within the same week, mapapaki-usapan sina Aura. BUT if it falls on separate weeks, that's where you'll be charge separate handling costs (plus the downside that you weren't able to maximize your package weight). In my case around three LPs arrived in a certain week and the balance six LPs the following week. Was rightfully charged separate handling (well rather than getting charged for each independent delivery by each merchant) - naka-tipid na rin.
Anyway it's still worth to request and relay in advance. Team JAC is very helpful in these types of situations.
Hope this helps!