With some Economy Fares the maximum combined Linear Length of any two pieces of checked baggage is 273cm/107in but no one piece may exceed a Linear Length of 158cm/62in - in which case the other piece may not exceed a Linear Length of 115cm/45in.
So for a 30 gram serving of protein it would cost about $1 per day. From these two samples of protein powder I found that an acceptable price range for 30 grams of protein from protein powder is between $1 and $1.50 (assuming close to equivalent protein powder quality).
On average, catering can cost anywhere between $8 and $75 per plate. Most caterers are going to fall between the $10 and $25 per person, but higher end caterers can be as high as $80. The cost of a caterer is going to greatly depend on the size of the party, the type of food being served, the type of catering and the company.