Found something similar in size to Otter 2000, at Wegman's with the back to school seasonal stuff.
Cheap for $2.49. Amazon wants $3.29. UK sells them for 2.99 BP.
Not polycarbonate, probably not waterproof and you can't drive over it with a truck. It does have a gasket though.
But, the 2 compartments can each hold an UNO and a half size breadboard, with a little room to spare.
Attaching the manufacturer's page (which is not for the 350ML/8.11 OZ. size) for an idea.
http://www.sistemaplastics.com/pages/KL ... r/1517.htm
Also attaching amazon page:
http://www.amazon.com/Sistema-11-8-Ounc ... 34-4302957
and one for UK:
http://www.cookmatesouthwest.co.uk/prod ... snack-box/
For some projects, or just transport, the Otter and Pelican type cases can be pricey.
May be worth a look, or maybe not up to your standards.